Have never thought of taking part in such courses. IMO, they won't help you at all. It's much better to find a reliable exchange like Binance or Changelly Pro and learn everything while trading small amounts.
Yes, They are literally never right about anything despite the fact that they are so obscure. They exist because there are a few novices those are falling for it. Those who are brand new to crypto, in a real sense have no clue about taking part the correct one and so far it seems like absolutely nobody knows what is going on and everybody just repeats the obvious, but using diverse phrasing so they sound like they know something. Kinda discouraging.