//=[Hacker/cheater]=\\
-Posibly hacker and cheater is the player that will ruin fun and making fun on other player. And using hack/cheat to have fun.
so no more. I can show how to spot them all :D

If this helped you enough, I really happy to help you.

X-Ray Cheat (This is not intresting but it could make some rare ore lost and we cant find it anymore)
-How to spot?
If Cheat? = If he mine and always find diamond/emerald and never find iron/gold this could be called as X-Ray. Or maybe :\
Beside Cheat? = Excactly if he is lucky peapole he will find diamond/emerald fast.

Bow-Aimbot (Shoot beside and head shot "aimbot")
-How to spot?
If Cheat? = He could spin arround and shooting and every single shoot he will never miss the shoot (sometime the shoot will be missed.) Also it could be hard to kill him if with melee range.
Beside Cheat? = Maybe he played minecraft so long and know all the trick so dont get upset with pro / veteran. sometime veteran / pro will cheat to. who think?

From Now I can tell you about those 2 from now. If you want more let me know on comment. -Good Detective