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Re:W3.css – A minimal alternative to Bootstrap by err4nt on Wednesday September 14, 2022 @10:53AM (#32838096)
They have some good resources for obscure technologies, like XPath, but for the big ones like HTML/CSS/JS there's both the danger that they're out of date and not showing you what's new, while also possibly showing you old hacks and workarounds that are against modern best practice.

MDN is a better choice for (almost) anything MDN has content for.

Re:W3.css – A minimal alternative to Bootstrap by rchaud on Wednesday September 14, 2022 @10:57AM (#32838172)
How much of the core of HTML/CSS/JS has been deprecated?

Somebody going to W3schools probably isn't looking for the latest and greatest. The person who is looking for that would already have a good grasp of the fundamentals, and would have graduated to looking elsewhere, like StackOverflow or Caniuse.com.