SEO techniques are the work, on the site and off it, that helps search engines find it, understand it and choose it: they fall into four families, namely technical, content, off-site and banned. They don't all have the same evidence behind them: some are written into Google's official requirements, others are measured by studies of billions of pages, and others again have, since 2024, been violations with a specific name in Google's spam policies.
The trouble is that lists of SEO techniques all look alike.
On 10 October 2026 we went through the nine articles on page one of Google UK for "seo techniques" (mobile search), and read the eight whose text we could open. Three don't give a source for any of their numbers, and one has no numbers at all. None names the three spam policies Google introduced in 2024.
So "write optimised content" and "do link building" end up on the same line, with the same weight. Even when one of the two, done the wrong way, makes you disappear from Google.
And curiosity runs the other way: in Google Ads data pulled with DataForSEO, in the UK "black hat seo" gets 390 searches a month, "white hat seo" 140. Nearly three times as much interest in shortcuts as in method.
We see the shortcuts arrive from the other side. Between 1 August and 5 October 2026 visilay.com received links from 408 new spam domains, 92% of them on cheap extensions and none on .it: we analysed them one by one in our article on negative SEO.
On the opposite side are projects built with boring techniques. Sunscape, which develops solar farms in Italy, went in six months from March 2026 from 1 to 38 keywords on page one out of 143, with monthly organic impressions rising from 329 to 5,809.
And what "advanced" technique was behind it?
None. An architecture of pages by region, built around how people search for land and solar plants, started in March 2026. Techniques with evidence level A in the table you'll find below.
In this guide you'll find:
- 16 SEO techniques in four families, each with its level of evidence and its source;
- the dates when Google changed its mind, from the keywords meta tag in 2009 to back button hijacking in 2026;
- which family to start from, depending on where your site is losing clicks.
If what you want is the order in which to work on a site you already have, we've set it out in our guide to how to improve a website's SEO. The point here is a different one: how well proven each technique is. Let's start.
How to read the level of evidence (four grades, one rule)
The level of evidence is the kind of source behind a technique. It doesn't measure how much the technique will do for your site: it measures how far you can trust whoever is selling it to you.
- A: Google describes it in its official documentation, as a requirement, a signal or a factor in local results.
- B: Google doesn't quantify it, but studies on large samples or Search Console data measure its effect.
- C: it works in the cases we see, but there's no public source that proves it at scale.
- X: it's a breach of the spam policies, with a name and a date.
The rule: anyone selling you a level C technique should tell you it's C. That isn't a flaw. It becomes one when it's presented as A.
The 16 SEO techniques in one table (with the source for each)
This is the complete map. The families follow the classic split into technical, on-page and off-page SEO, which we explain in our guide to the types of SEO, plus a fourth column that almost every list forgets: the banned techniques.
| # | Technique | Family | Level of evidence | Main source |
|---|---|---|---|---|
| 1 | Make pages crawlable and indexable | Technical | A | Google, Search technical requirements |
| 2 | Serve the site over HTTPS | Technical | A (lightweight signal) | Google, August 2014 |
| 3 | Meet the Core Web Vitals thresholds | Technical | A (limited weight) | Google, Core Web Vitals documentation |
| 4 | Add structured data | Technical | A (on appearance, not ranking) | Google, changes to FAQ and HowTo results, August 2023 |
| 5 | Build internal links to the pages that matter | Technical | A | Google, SEO Starter Guide |
| 6 | Match the page to search intent | Content | A | Google, guide to helpful, reliable content |
| 7 | Rewrite titles and snippets on pages with low CTR | Content | B | Search Console, project data |
| 8 | Update the pages you already have | Content | B | Ahrefs, study on the age of top 10 pages |
| 9 | Merge pages competing for the same query | Content | C | Project experience |
| 10 | Answer questions in dedicated sections | Content | B | Pew Research Center, March 2025 |
| 11 | Earn backlinks from relevant sites | Off-site | B | Ahrefs, 14 billion pages |
| 12 | Get cited by trade press and industry sources | Off-site | C | Project experience |
| 13 | Collect reviews on your Business Profile | Off-site (local) | A | Google, guide to local ranking |
| 14 | Buy or swap links that pass ranking | Banned | X | Spam policies, link spam |
| 15 | Publish pages in bulk with no added value | Banned | X | Spam policies, March 2024 |
| 16 | Exploit expired domains or other sites' reputation | Banned | X | Spam policies, March 2024 |
Two things stand out.
Seven techniques out of sixteen have direct evidence from Google, and none of them is "advanced". The second: the three banned techniques are also the ones most often sold as shortcuts.
The technical family: five jobs, two of them overrated
Technical SEO techniques are the ones that let Google reach the page, read it and add it to the index. Without them, the other thirteen don't get started.
1. Crawling and indexing
Google Search's technical requirements are three: Googlebot mustn't be blocked, the page must return a 200 status code and it must have indexable content. It's the technique with the strongest evidence and the shortest job: you check it in the Pages report in Search Console. What to look at first, and in what order, is in our guide to technical SEO.
2. HTTPS
Google announced it as a ranking signal in August 2014, calling it "a very lightweight signal", affecting fewer than 1% of global queries and carrying less weight than high-quality content. Do it because without HTTPS the browser flags the site as not secure. Not because it moves you up.
3. Core Web Vitals
The official thresholds are LCP under 2.5 seconds, INP under 200 milliseconds and CLS under 0.1. So if my score is 62 out of 100, am I losing rankings?
No. The lab score isn't what Google uses: what counts is data from real visits. Above the threshold it's worth acting, below it every tenth of a second you shave off makes little difference. The detail is in our guide to Core Web Vitals.
4. Structured data
It changes how a result looks, not where it sits. And even the look can disappear: in August 2023 Google decided that FAQ rich results would only be shown for "well-known, authoritative government and health websites". Anyone who had put FAQ markup on every page to take up more space in the results lost that result without changing a line.
5. Internal links
Google uses links to discover pages and to understand what they're about, as it says in the SEO Starter Guide. It's the only authority lever you control 100%. On our blog it's a fixed rule: every new article gets three to five links from pieces already published, on the day it goes live. How many you need and how to write the anchor text is in our guide to internal links.
The content family: where you win almost every time (and the technique with no evidence)
Content techniques decide whether an indexed page deserves to sit above the others. It's the family where most rankings are won or lost.
6. Search intent
Google asks for "helpful, reliable, people-first content", and the practical test is the results page: if your query shows ten product listings, an article won't rank, however well it's written. The check takes two minutes and should be done before you write.
7. Titles and snippets
On an Italian sports equipment shop we work on, between May and August 2026, generic queries in position 1 had a CTR of 7.29%; between positions 4 and 10, 1.03%. Rewriting the titles and meta descriptions of pages with lots of impressions and few clicks moves clicks without gaining a single position. The full table is in the guide to improving SEO linked above.
8. Update rather than publish
Google's first pages are getting older: in the 2025 Ahrefs study (US keywords) 72.9% of the pages in the top 10 are more than three years old. A page Google already shows is worth more than a new one. Macropix, a Milan manufacturer of LED screens, went from position 88 to 2 in five years on Google Italy for "monitor pubblicitario" (advertising display) by working on the same pages instead of adding new ones. It's also why SEO timescales vary so much from project to project, as we explain in how long SEO takes to show results.
9. Merge pages that compete with each other
Level C, and we say so openly. There's no large-scale public study, but on sites that have published for years without a plan we often find two or three URLs splitting the impressions for the same query. A single, more complete page, with 301 redirects from the others, almost always does better than the three separately.
10. Questions with a straight answer
Pew Research Center analysed 68,879 searches made by 900 US adults in March 2025: queries starting with words like who, what, when or why produced an AI summary 60% of the time. A US sample, but the logic travels. The question as a heading, the answer in the first two lines: it's the format answer engines are happiest to lift.
And text length? It isn't a technique. Google's starter guide is clear: the length of the content alone doesn't matter for ranking purposes. Along with keyword density it's one of the eleven SEO myths we checked document by document.
The off-site family: links, citations, reviews (and 408 domains that don't count)
Off-site techniques work on what other sites, publications and customers say about you. They're the slowest and the easiest to fake.
11. Relevant backlinks
The most quoted figure comes from Ahrefs, which analysed around 14 billion pages: 96.55% get no traffic at all from Google. Of the roughly 20 million pages with no referring domains, only 2,997 get more than a thousand visits a month. Global sample, study from December 2023.
So the more links I buy, the better?
No. The 408 spam domains that turned up at visilay.com are links too: 76% have a DataForSEO spam score of 55 or more, 57% have the word "checker" in their name, and none is about our industry. That's exactly the kind of link Google has said it discounts since 2016. The link that counts is one from a site your customer reads. What the data says about how much links still weigh is in our guide to link building.
12. Industry citations
Level C, and we say so openly. Google publishes nothing on how much a mention in a trade publication weighs, and the studies that measure it use the tools' own proprietary metrics. On our projects we see that a citation comes when there's data worth citing: an original table, a number nobody else publishes. How to build one is in our guide to digital PR.
13. Reviews
Here the evidence is A, and that's rare. In its guide to local ranking Google writes that local results are mainly based on relevance, distance and prominence, and that prominence also depends on reviews: "More reviews and positive ratings can help your business's local ranking". For a local business it's the off-site technique with the best ratio of evidence to effort. How to work on the profile is in our guide to Google Business Profile optimisation.
Banned techniques: three violations with a date of birth (and what they cost)
A banned technique is a practice Google has described by name in its spam policies: it can lead to a manual action or an automatic demotion. These are the three most often sold to businesses.
14. Buying or swapping links
It's been banned since 2012, when the update later called Penguin hit about 3.1% of queries in English. Since 2016 Penguin has worked in real time and discounts spam links rather than hitting the whole site. In 2022, according to Google's webspam report, SpamBrain detected 50 times more link spam sites than in the previous link spam update.
The real cost isn't the penalty. It's the budget spent on links that, at best, Google ignores.
15. Pages in bulk
The policies call it scaled content abuse: producing many pages with the main aim of manipulating rankings. One of the examples given, word for word, is using generative AI to create many pages without adding value. The policy dates from March 2024 and, once the rollout was complete, Google reported 45% less low-quality, unoriginal content in its results. AI in itself isn't banned: we explain the difference in AI-generated content.
16. Expired domains and borrowed reputation
Buying an expired domain to fill it with low-value content is expired domain abuse. Publishing third-party content on an authoritative site to exploit its signals falls under the site reputation policy, enforced from 5 May 2024. It's the same logic as many packages sold as "articles on high-authority sites": the value on offer is another domain's reputation, not a reader.
Paying for links or articles on high-authority sites?
You've just seen that, at best, Google ignores link spam. Before you renew that package, let's look together at where your rankings really come from and which techniques your budget should move to.
Book a strategy consultationIf the damage is already done and there's a manual action in Search Console, the way out is in our guide to Google penalties.
When Google changed its mind: the timeline from 2009 to 2026
SEO techniques aren't fixed: they change status. This is the timeline of the moments that moved a technique from one column to another, each with Google's original document.
| Date | Technique | What Google decided | Status today |
|---|---|---|---|
| September 2009 | Keywords meta tag | Not used in ranking | Pointless |
| April 2012 | Bought links and link networks | Webspam update, about 3.1% of queries in English | Banned |
| August 2014 | HTTPS | Lightweight signal, fewer than 1% of queries | Basic requirement |
| September 2016 | Link spam | Penguin in real time, discounts links instead of hitting the site | Banned, often ignored |
| September 2019 | Nofollow attribute | Becomes a hint, sponsored and ugc introduced | Required on paid links |
| August 2023 | FAQ markup | FAQ results only for authoritative government and health sites | Useful for very few |
| March 2024 | Page interactivity | INP replaces FID in Core Web Vitals | 200 ms threshold |
| March 2024 | Bulk pages, expired domains, other sites' reputation | Three new spam policies | Banned |
| April 2026 | Back button hijacking | New spam policy, enforced from 15 June 2026 | Banned |
The last row is the most instructive. Back button hijacking is the practice of tampering with the browser's Back button so the user can't return to the page they came from: Google treats it as deceptive and provides for manual actions or automatic demotions. A conversion trick, not an SEO one, that ended up in the spam policies.
How to read updates as they roll out is covered in our guide to Google algorithm updates, and the line between allowed and banned practices, policy by policy, in white hat SEO.
Which family to start from (it depends on where you lose clicks)
Search Console decides which family to start from, not the list. Four cases:
- Important pages not indexed: technical family, techniques 1 and 5.
- Lots of queries between positions 8 and 20: content family, techniques 6, 8 and 9.
- Good rankings and few clicks: technique 7, titles and snippets.
- A business with local customers: technique 13 before any link.
Off-site techniques come later, almost always. It's the order we follow on the projects in our SEO service: first remove whatever stops Google from reading the site, then work on the pages it already shows, and only at the end on what others say about you.
Frequently asked questions about SEO techniques
It depends on where the site is losing clicks. If pages aren't indexed you need the technical family; if they sit between positions 8 and 20, the content techniques. In general the best proven are indexing, internal links, search intent and updating the pages Google already shows.
No, not for long. Since 2016 Google has discounted spam links in real time, in 2022 SpamBrain detected 50 times more link spam sites than in the previous update, and since March 2024 bulk pages have been a violation with a specific name.
No. The spam policies ban generating many pages with the main aim of manipulating rankings, with or without AI. Content written with AI and checked by a person who adds data and verification doesn't breach any policy.
No. It changes how the result looks, for example with prices, stars or events, and can improve CTR. Even the look isn't guaranteed: since August 2023 FAQ results only appear for authoritative government and health sites.
Yes. The techniques with the highest level of evidence, namely indexing, internal links, titles and search intent, can be applied with Search Console and a bit of method. You need help when the problems are structural, such as a migration or a catalogue that needs reorganising.
What's left (and the test for whether a technique will last)
One line per point:
Four families: technical, content, off-site, banned.
Seven techniques out of sixteen have written evidence from Google.
HTTPS and Core Web Vitals are requirements, not accelerators.
Reviews are the only off-site technique with level A evidence.
Buying links costs you twice: the price and the risk.
There's one more thing the industry rarely says. Look at the timeline: bought links in 2012, bulk pages in 2024, a tampered Back button in 2026. Every technique that ended up banned worked only because there was an algorithm to fool. The most reliable test of an SEO technique is to ask whether it would make sense if Google didn't exist. A page that answers better, a customer who leaves a review, a link from a publication your customer reads: yes. A bundle of links from domains with "checker" in the name: no. Techniques of the first kind haven't changed column once in seventeen years of Google documents.
