Cs go VAC BAN question :)

Hello all :)
I would like to know how the cs go bans work, so i can buy the hack from here and start cheating,

Now: I want to hack on a SMURF/Second account But if the smurf gets a VAC BAN, will that affect my main account in any way ?
Are there some things i have to do to prevent this from happening ?

I want my main account to be clean for 100% sure please let me know