Help me with QubeOS (as beginner)

Hello, I’m beginner to QubeOS and I don’t know really how to use it properly. I’m not really an absolute beginner in Linux (running it since 2 years), but I’ve never tried it and these I wanna try so installed it 2 days ago. At first it’s very good, not laggy, etc… It’s what I want! But today I want to really set...