New to crypto- Questions

Hello. I've been reading up on crypto and bitcoin and there's a lot to learn.

1. I read in the cons section that you need to double and triple check your address to make sure it's yours and not some dead-end one. How would I do this?

2. If I accidentally buy fraudulent crypto or coins, how would I know? Would they be able to hack my crypto wallet and bank account on top of losing the investment?

3. I read that it only takes 5 - 10 billion dollars to take over bitcoin equipment and start making blank coins and halt the system. Is that true/likely?

Thanks in advance for the help. :)