It is good to learn to see how it really goes but there are many of them that takes advantage of their viewers. They'll suggest you to buy altcoins that you might not want but because you're a newbie, you're likely to follow it too.
Be aware of that.
It's actually a good thing to learn how to trade crypto properly on YouTube, lots of good content on YouTube, can explain trading technicalities.
But as you said, there are some irresponsible youtubers by promoting certain projects for personal gain. The dangerous thing is that many
beginners believe everything their favorite youtubers say, and followed the advice of those youtubers and ended up losing money. So the conclusion is
only to learn technical things for crypto trading on YouTube, but project selection don't follow what youtubers say, we must do our own analysis
and research before deciding to buy certain projects.