if anyone have more to add, so I can also learn?
Emotions, first thing that comes to my mind is having control over emotions. If anyone asks me about learning trading, first I will ask them if they have the will to rely on data analysis and strategy rather than taking decision based on their emotions. This is a very important thing in trading, which many people ignores, thinking that it's not that important. This is the reason why they face those problems which you have mentioned.
Also when learning trading, you should always start with
low amount. Try out your strategy and skills, and then go for the big round.
Your own contribution is really nice too,the little I want to add is that so many beginners don't like making research before engaging into trading.Research gives you the opportunity to know the type of coin you will invest in,it also gives you the opportunity to know whether the coin will grow or not,it also make you to know the different seasons that the market is favourable and when it is not,it also gives you the ample opportunity to know projects that will do well in the nearest future and the one that will be a waste of resources.These and many more are what research does.Most of the beginners who end up losing multiple times normally fall victims of this mistakes.