You only understand after doing it for a while: profitable trades are worth reviewing too, so you can figure out whether your method was right or you just got lucky.
Knowing why you made money is how you can do it again next time.
Right now, $XRP is at 0.9521, down 1.43% over 24 hours. Have you set trading rules for yourselves?

I often get it wrong too, relying on my own judgment.