Poker tournaments are easier for a beginner to learn but they also require a large time commitment and your winnings will be very inconsistent. Cash games on the other hand offer much less demands on your time and your winnings will be a lot more consistent.
MTT stands for Multi-Table Tournament, which is a poker tournament with players filling multiple tables, as opposed to single table tournaments/sit & gos. The World Series of Poker Main Event is perhaps the most famous multi-table tournament in the world.
