What are the general basic principles behind those advertised “learn to day trade” Youtube ads

It's counterintuitive but I'm getting more and more Youtube ads from people claiming they can teach “almost anyone” to make extra cash in the market.

I know from experience that although these ads are generally BS, they sometimes are based on some kind of principle. The caveat is of course that:

• All the claims of success as highly exaggerated and the losses hidden.
• The student testimonials are probably dodgy.
• Get-rich-quick schemes only benefit the seller of the courses.

However, I could guess some of the principles behind some of these course:

• Ads about “make money on stocks you were going to buy any way” — Probably about the wheel.
• Ads about “learn how the elite are trading and follow the money” — Probably about following the trades of Congress and CEOs via disclosures.

There are many variations of these courses. I was wondering if you guys can point out the principles that these courses are based on. For example, one I get a lot lately:

• Ad about “trading on reversals” — what kind of technical trading is this?

Warning: I think you cannot link to Youtube videos here. So don't link to any of these courses even if it is to show a bad example.

tldr All these courses being advertised — what sliver of useful information are they based on? If you took one (no judgement), what was it like?