> I've found sorta the opposite - in any area, it can just do everything for you, or it can be an incredible teacher.

Please don't. I've had all of Codex, Claude and Gemini convincingly tell me absolutely wrong stuff, pointing it out with easily verifiable example they come up with more and more weird reasons.

Things don't become correct simply because most sources are again - easily and logically verifiable - wrong. This already was a plague when people "just googled" stuff and effectively returned with the most SEO optimized answer. Now we have very convincingly written instances all over the place.

If these were singular instances I wouldn't be so worried, but if you are learning it already is very easy to learn something wrong. This is why back in the days when people still used physical books to learn new things it was a good idea to check first which books are actually recommended. There have been a lot of "experts" that wrote things they clearly misunderstood but worked for all the examples in their books.

To give a common example for both the backend and frontend devs, that isn't about a specific projects. LLMs and Google searches frequently turn out wrong results regarding CORS caching and how it works in relation to domains/hostnames. The circumstances under which Content-Disposition work are another example. I think a lot of wrong statements that LLMs are "convinced" about are due to wrong statements (sometimes in otherwise correct response) of popular Stack Overflow answers.

It's saddening how much wrong "common knowledge" exists in the industry. I have been bitten by a lot of these, but it feels when people don't even actually code and think anymore this will just rise forever.

> Please don't.

I will.

Can these be wrong? Certainly. So can humans. Many of your examples are of humans being wrong. That doesn't make LLMs - or humans - useless. The fact that they are not infallible is not a reason to avoid using them and I'm not going to throw out a tool that has been incredibly valuable to me because someone on the internet got some bad CORS advice.