Hand 1 I bet turn, I don't like the free card on that board
Hand 2 Bigger turn bet of $18, river call OK
Hand 3 raising in that spot is bad. You have committed yourself and are only called by better hands. Either call his raise, or choose to fight another day. What sucks is a lot of loose players call in SB or BB cuz of the "discount" especially with suited cards like 75 or whatever, so consider position here.