Free Cheat sheet · Updated 2026-10

Google Ranking Systems Cheat Sheet (All 17, in Plain English)

Every system Google publicly names, what it does, and the 3 you can influence this month.

One page that explains every ranking system Google publishes, in words a small business owner can use. Stop panicking about 'the algorithm' and work on the few systems you can actually move.

For: Founders and small teams who hear about Google updates and want to know what actually changed and what to do.

The 17 ranking systems Google publicly names · 17
Retired systems you still hear about · 4
What a core update really is (and what to do) · 8
Spam policies in one line each · 16
The 3 systems you can influence this month · 3

How to use it

Read the table once so you know the names. You will hear them again in every SEO news story.
Skip to 'The 3 systems you can influence this month' and pick one task.
When a core update rolls out, use the checklist in section 3 before you change anything.

The 17 ranking systems Google publicly names

Google doesn't have one algorithm. Its guide to ranking systems (last updated 10 Dec 2025) lists these. The 'what it means for you' column is my plain-English take.

System	What Google says it does	What it means for you
BERT	Helps understand how combinations of words express meaning and intent.	Write the way people talk. Small words like 'for' and 'without' change the answer.
Crisis information systems	Shows hotlines and official info during personal crises and disasters (SOS Alerts).	Not something you optimise for.
Deduplication systems	Hides near-identical results and doesn't repeat a featured snippet as a normal listing on page one.	Ten near-copies of the same page won't get ten spots.
Exact match domain system	Limits credit for domains made to match a query, like best-plumber-austin.com.	A keyword domain is not a shortcut.
Freshness systems	Shows newer content where recency is expected (news, new releases).	Only matters for searches where 'new' is the point. Updating a date alone does nothing.
Link analysis systems and PageRank	Uses how pages link to each other to understand what they're about and how helpful they may be.	Real links and mentions still count. So do your own internal links.
Local news systems	Surfaces local news sources in Top stories and Local news.	Relevant if you publish local news.
MUM	An AI model used for specific applications, not general ranking.	Ignore anyone who says 'optimise for MUM'.
Neural matching	Matches concepts in queries to concepts in pages.	You don't need every keyword variation. Cover the topic clearly.
Original content systems	Helps original content, including original reporting, rank above pages that only cite it.	Be the source: your own data, photos, prices, process.
Removal-based demotion systems	Demotes sites with many legal or personal-information removals.	Don't publish copyrighted or doxxing content.
Passage ranking system	Judges individual sections of a page for relevance.	A clear answer in one section of a long page can rank on its own.
RankBrain	Relates words to concepts so pages rank without the exact words.	Same lesson as neural matching: answer the need, not the string.
Reliable information systems	Surfaces authoritative pages, demotes low-quality ones, shows advisories when confidence is low.	Matters most for health, money and news topics.
Reviews system	Rewards reviews with insightful analysis and original research by people who know the topic.	If you review products, show you used them: photos, measurements, pros and cons.
Site diversity system	Generally limits top results to two listings from the same site (subdomains count as the root).	You usually get two shots per search, not five.
Spam detection systems	Systems including SpamBrain that handle content and behaviour against spam policies.	Read the spam policies once (section 4). Breaking them can sink a site.

Retired systems you still hear about

Name	What happened to it
Helpful content system	Became part of the core ranking systems in March 2024. 'Helpful content update' is no longer a separate thing.
Panda	Folded into the core ranking systems in 2015.
Penguin	Link spam system, integrated into core ranking in 2016.
Hummingbird	A big 2013 improvement. Ranking has kept evolving since.

What a core update really is (and what to do)

Google says core updates are broad changes that 'don't target specific sites or individual web pages', and they happen several times a year. Use this checklist before you touch anything.

Check the Search Status Dashboard (status.search.google.com) and note the update's start and end dates.
You can't judge an update that is still rolling out.
Wait at least one full week after it finishes before you analyse Search Console.
This is Google's own advice in its core updates guide.
Compare the week after with the week before the update started, page by page.
Site-wide totals hide which pages actually moved.
Small drop (like position 2 to 4)? Do nothing drastic.
Google says small shifts are normal fluctuation.
Big sustained drop (like position 4 to 29)? Compare your page with the pages that now rank above you, honestly.
Ask which one a searcher would rather read.
Run Google's 'helpful, reliable, people-first content' self-assessment questions on your worst-hit pages.
It's the closest thing to an official checklist.
Improve pages before deleting them. Delete only what can't be saved.
Google calls deletion a last resort.
Expect it to take months, and maybe until the next core update.
Google says it can take several months for its systems to confirm a site has improved, with no guarantee.

Spam policies in one line each

Spam systems enforce these 16 policies. If you do any of them, fix that before anything else.

Policy	In plain English
Cloaking	Showing Google different content than people see.
Doorway abuse	Lots of near-identical pages built to catch searches and funnel people elsewhere.
Expired domain abuse	Buying an old domain to rank weak content on its past reputation.
Hacked content	Content placed on your site by an attacker. Keep your CMS updated.
Hidden text and link abuse	Text or links people can't see but Google can.
Keyword stuffing	Repeating words unnaturally.
Link spam	Buying, selling or trading links to manipulate rankings.
Machine-generated traffic	Bots sending automated queries to Google.
Malicious practices	Malware, unwanted software, harmful behaviour.
Misleading functionality	Fake tools or features that trick people.
Scaled content abuse	Mass-producing pages (by AI, people or both) with little value.
Scraping	Republishing other sites' content without adding value.
Site reputation abuse	Third-party pages riding a host site's reputation (the 'parasite SEO' policy).
Sneaky redirects	Sending people somewhere other than what Google saw.
Thin affiliation	Affiliate pages that copy product descriptions and add nothing.
User-generated spam	Spam in your comments, forums or profiles. Moderate them.

The 3 systems you can influence this month

Original content: publish one thing only you can say
Pick your most important service page. Add something nobody else has: your real prices or price ranges, photos of your own work, the steps you actually follow, the questions customers ask you. Original content systems are built to reward the source over the copy.
Links: fix internal links today, earn one real mention this month
Link to your money pages from your homepage and from related posts, with descriptive anchor text. Then ask one partner, supplier or local group to mention you with a link. Real links still feed link analysis systems.
Passage ranking: answer one question in one clear section
Under a heading phrased like the question, answer it in the first one or two sentences, then explain. A strong section can rank even inside a long page.

Unlock the full cheat sheet

Everything above, plus the branded PDF to keep.

FAQ

Frequently asked questions

How many ranking systems does Google have?

Google's public guide names 17 active ranking systems plus 4 retired ones (as of its 10 Dec 2025 update). It also says it uses many more systems it doesn't list individually.

Is the helpful content update still a thing?

Not as a separate system. Google says the helpful content system became part of its core ranking systems in March 2024.

Was my site penalised by a core update?

Core updates are not penalties. Google says they are broad and don't target specific sites. A manual action (a real penalty) shows up in Search Console under Security & Manual Actions.

Is E-E-A-T a ranking system?

No. Google's SEO Starter Guide says E-E-A-T is not a ranking factor. It's a way Google describes what its systems try to reward.