I model time to time and have friends who are exclusively fitness models. Needless to say their Instagram "natty" profiles are

My friend keeps pushing me to cycle, get shredded, blah blah blah and told me to "just do what he does" and this is what he said:

"so what I do now is I never come off so I don't get side effects lol...I just cruise and blast
I take 800mg Eq and 1000ml test and 50mg dbol .."

This doesn't sound safe to me from my limited knowledge, can someone explain to me why this is bad to do?
I obviously can't just say "That's wrong" without any knowledge haha.
Just looking for information, thanks.