Why 3-bet

3-bet for value (strong hands) and as a bluff (hands with blockers/playability) vs players who fold too much. Vs calling stations, 3-bet value-heavy and bluff less.

3-bet to punish wide opens or for value. Vs stations, value-heavier; vs folders, some light IP 3-bets. Blind multiway light 3-bets are a leak.