I think the most important thing to become a trader is to control your emotions.
It's actually conclude those 4 points on that article, emotion is the hardest thing to handle when it comes to trading because when you are falling to your emotions then it could lead you to greediness and make stuff worse.
I'm a noob, but is it possible for everyone to make a profit, or must there always be losers?
There is a day that you will be a loser and later you can be a winner, just don't overthink about that stuff.
Number 2 doesn't really matter too much in crypto trading... I don't know for others though.
That is why it said for Forex dude.