Hi amigos.. let's keep it simple ;

1) You need a technical edge, a system that puts the odds in your favour.
                           There are countless schools of analysis and strategies you can dive into— From my experience, this is the best one you can learn:Technical analysis / Volume Profile / Order Flow ...
                           but the most important thing, Is mastering them like a true maestro... And that, my friend, takes time, patience, and relentless training.
                           PS : everything is free online , you dont need to buy a shit. youtube is your friend.

2) Money management - You need to understand risk and be able to manage this ongoing.
                             I’ll leave the floor to you to talk about this field from your own exprience.
                     
3) Psychology - You need to learn, understand and be able to apply trading psychology 24/7.
                                          There are some individuals—psychiatrists and seasoned minds—who offer teachings in this domain.
                                          ex : Rande Howell - Tom hougaard - brett steenbarger
                                          They all run YouTube channels.

You must have all three to trade successfully and they're written in order of importance.
You must also learn each aspect in the order I have written them. You can be a master of trading psychology or money management, but if you don't have a technical edge you won't make money.
95% of retail traders never overcome step 1, this is why so many fail.