Whatever knowledge you will be acquiring from books/videos/demo accounts, that will not be enough even for spot trading then I'm not sure how people are getting ready for margin trading. When experienced traders are not consistently making profits in spot trading, it is highly recommended never think about margin trading.
Margin trading is associated with a high risk of losing money, so it is also dangerous for both beginners and experienced traders. But unlike beginners, experienced traders, thanks to their knowledge and experience, can significantly reduce the risk of losing money.
But if you notice that even pro traders are facing hitting stoploss time to time due to unpredictable volatile nature of bitcoins and all these are based on spot trading. It means even pro traders are struggling for consistency in spot trading then in my opinion also that margin trading is too dangers for experienced traders as well. We better stick within sport trading to eliminate the risks at massive percentage.