Another laugh of recognition at Penelope's education post. That school saved me; I'd be an even worse mess by now if Dad hadn't pushed for it.
I'd rather not have had my dad at all, but he taught me some things that have proved useful:
If you're sexually assaulted, your attacker doesn't define himself as a rapist. Try to establish where he's coming from and use that to halt the attack or get away.
If you must fight, don't fuck around. He taught me how to deliver a knockout punch, to temporarily disable and to permanently maim an attacker.
There is no magic. Everything's a question of maths, so try to evaluate the numbers.
Never criticise another's appearance or their home (unless they asked you to, obv).
Walk two miles a day.
Stick it out for a fixed period. If it hasn't improved by your deadline, quit. (He should have followed his own advice.)
Never get into a situation you can't get out of.
Bullies only understand their own language (he was eminently qualified to know that) - if a bully scares you, scare them more.
If you see a person in distress, try to help (unless it's your wife or children, plainly!) - bearing in mind the rules above.
His world was a dark place :(