Do you often watch videos like this to improve your skills in playing BlackJack or other card games? Or do you feel so confident in your abilities that you don't need such video courses?
As someone who often plays blackjack for fun and for gambling, I do think that reading and watching videos may help someone learn the basics and the foundation of the game. In addition, this may also help them better understand the dynamics and learn new techniques in order to at least mitigate the risks of betting. However, I also do think that such is unnecessary especially if you are a person who wants to gamble quickly without wasting any time.
These courses are definitely great and they help people understand better the basics of the game. If you have the extra time to watch the videos and learn the courses, then feel free to do so. But if you are someone who just wants to gamble out of sheer curiosity, luck, and/or entertainment, then it's better to skip it.