Is it a bad idea to learn about cracking from the dark web? I mean they seem like they know their shit with security

They might be tracking you as we speak.

No cause you probably don't know how to protect yourself completly yet

So far I know there are good tutorials on the normal web. It's not that difficult.

@Jifuna any specifically?

I think you googled already but maybe I can help you a bit. If you want to learn more about password cracking:

https://wordfence.com/learn/...

And after that lookup some tutorials about programs like hashcat, John the ripper and hydra(online cracking).
But use it responsible ;) It's interesting tho.