A search engine has three jobs: find pages, understand them, and order them. Each has changed substantially.
Finding
Automated programs follow links across the web and store what they find. Pages nobody links to are hard to discover, which is why links have always mattered.
Understanding
Historically this meant matching words. Now it means interpreting intent – understanding that several different phrasings are the same question, and that a query has a purpose behind it.
That is why exact keyword matching stopped working as an optimisation strategy.
Ordering
Hundreds of signals, of which a few dominate. Whether other reputable sites link to the page. Whether the content matches the intent behind the query. Whether people who click stay or come back and try another result. Speed and usability. And for topics touching health, money or safety, evidence that the source is credible.
What changed recently
Generated answers at the top of the results, which summarise rather than link. That answers many questions without a click, which has reduced traffic to sites that provided those answers.
The consequence is that content which merely states facts has less value than content offering something a summary cannot replace – direct experience, original data, a considered opinion.
What this means if you publish
Write what a summary cannot. Be identifiably someone. Cover things properly rather than thinly across many topics.
The tactics that worked when matching was mechanical do not work now, and the advice that survives is essentially to be genuinely useful.