most mistakes of traders are;
* Thinking it's a get rich quick scheme or thinking that it's easy.
* Having no proper training in the craft to attain knowledge about it.
* Watching one two or three video's on YouTube by one YouTube influencer and think they are ready for it or thinking they have known the craft.
* Having no experience traders that is good in the craft to guide them.
Similar thing to gambling, people thought is an easy process to make money which in reality, this is like a work that we control our profits. People thought it's the safe haven for financial freedom which is not, you still need some knowledge and some discipline in order to win in trading.
Also I agree to that thing about youtube, sometimes even if you have a years of experience, you're still prone for failing in trading because like in the crypto market, is very unpredictable and volatile, if you're just a small fish and hoping for a maximized profit, sometimes you're getting swallowed by whales or market manipulation. Also, in trading, it's not about knowing it all, it's about being observant to the flow of the market, observing every unusual thing in the market. I get it that people know these tools and such for analysis, but a good trader is very disciplined and ready to put some big effort just to gain.