Definition of pot bet
An "pot bet" is a bet equal to the size of the pot. If on flop there is €10 in the pot and a player bets €10, it is called an "pot bet". This is not the usual bet on the pokerth. It is not uncommon either, but it is far from being the most common bet. Usually, on the flopth, players will bet 33% pot, 50% pot or 75% pot. When they make an pot bet, it is because they have a specific reason, for example, to discourage a player from running a draw.
If you roll an pot bet, have a maid do it.
Usually you want to give your opponent a difficult decision. If we bet 50% pot, we often give him a difficult decision with a good part of his range. If we pot bet, for him, the decision will be easier. He will no longer pay with his low draw and when he has a monster (a very strong hand), you will simply have lost more money with your biggest bet. There are still good reasons for pot bet, but you have to be careful. For example, if you are playing against a player who loves to pay pot bets with simple draws, don't be afraid to bet big.