I haven't paid any courses that relates to crypto trading, and if there is, I'm pretty sure that it's a paid one, and yes there's nothing wrong with the knowledge and experience being paid, but I always believe that learning from your OWN experience is better than with someone else.
Other people can teach you strategies. Other people can give your courses here and there just for you to learn, but what happened to them doesn't guarantee that it will happen to you. I don't usually recommend newbie to try leverage trading, but if you really wanted to, make sure that you're ready for the risk that you will be facing because 99% or even 100% of newbies lose their capital in their first try. Your own experience matters. I don't think that there's any course out there that gives you live examples, or backtested strategies like you said because a strategy that works for the expert might not work for you as a newbie.
You can watch videos all you want. You can read threads related to trading all the time that you want, but that doesn't guarantee you success. I'll repeat it again. YOUR OWN EXPERIENCE MATTERS.
It is true that you learn better from your own experiences, but you must agree with me that there is no need experiencing some minor setbacks which others have encountered and have put down their experience into writing or courses that you can learn from. I recommend learning the basics from someone practicing what they teach and recording some very good degree of success.
It is also partially true that not all goodies that your instructor experiences that yourself would experience, but it is important you have a knowledge of many working strategies because it would help you in the formulation of your unique profit pattern.