DOUBTS ABOUT HIVE, help friends

I have a lot of doubts and questions about Hive and its ecosystem, I will summarize them for you to see if you can help me.

1; if for example I have 1000 HP, I earn 2.94% apr and if I vote regularly what apr% do I earn approximately from the votes?

1. What if I voted for my own posts and comments? Is it legal or not?

2. Where does the 20% APR from save HBD come from?

3. Can you see somewhere the approximate monthly % APR % of the pools by commissions ? even if they're past