What's one practical financial habit you've adopted as a student that you wish everyone knew about?

What's the most surprising outcome you've witnessed or heard about when someone tried to assert dominance but ended up outmatched?
What can one do when I'm digging through my past trying find answers for the huge mistakes I've made as a stupid criminal and now my family doesn't treat me the same as it was my fault metaphorically that I caused a fire that ruined a happy family?