I've seen players short the pot and verbally lie about what they hold. I've heard them cuss and berate other players. I've seen them purposely spill water on the table to cause confusion. I've witnessed collusion between players. I don't need it.
Poker tournaments are a good venue for beginning players.
It's a good place to get accustomed to the ins and outs of the game. And, if you really like them, by all means, stick with them. Otherwise, use them as a training ground. I know many people in the poker game. Some of them are truly outstanding players who either supplement their incomes with their poker winnings or play the game for a living.