Metagaming: Meta gaming is when you have knowledge of whats about to happen, even though there’s no way you should know that without a 3rd partys assistance. When playing factions there’s a hack called ‘Freecam’. This allows players to see through a base so they know whats exactly in the base. This shouldn’t be possible in normal minecraft without a 3rd party client.
Powergaming: Almost as if playing RPG where its main point is competitiveness, though in reality the only competive thing about power gaming is is who can come up with the most powerful trait for their character has. An example of this, is a southpark episode, “good times with weapons”. The kids get ninja weapons and then “pretend” to have ninja abilities, cartman claims his power is having all the powers he can think of, which is power gaming.