I'm seeing things like 2FA which i don't understand and there's a lot of markets now. Where should i begin to figure everything out again? I have my tor browser and a btc wallet just need to know what 2FA is and what market is the best atm if that is allowed. Thanks.
2fa is like adding another password to your account that only the private keyholder can decrypt/use. It stops someone from bruteforcing your account and also helps prevent phising attempts.