Exploit bans WTF?

Just saw like 6 ppl banned for exploiting on lordaeron. How is anyone who noob as me supposted to know if that and that is exploit is not intended feature of the game. How is anyone supposted to know that hmmm??? There is no official list of exploit.

So tell me. How is ANYONE supposted to know that moveing the boss to there and there so he stopps attacking is exploit and not intended feature of the game just HOW????? HMM??? Theres no way unless you know every ability of every npc and every feature of WoW. So imho its total bull**** to ban ppl for exploiting bcz how the hell are they supposted to know they are exploiting. Just how?

If something works some way i will always assume its intended so just wtf with these exploit bans.........

Common sense is a good start.
Moving somewhere where a boss stops attacking feels like a "feature" to you?