1st hand

I don't mind three betting preflop and taking it down right there if the guy is raising a lot preflop. I would call more than 3betting though but you can mix it up. You aren't gonna win a big pot with 7's unless u flop a set and so after having called preflop and getting this board i would definitely raise. I can get value if the SB elects to call with some gut shot or pair and gut shot. The pfr is gonna have missed this board quite a bit but u cant really like any over cards or a 3 in this spot. I would play a small to medium pot with this hand. raise to a about 7 on the flop. If you get re raised its an easy fold and if u get called you can barrel a lot of turn cards. I just think by raising ur not turning ur hand into a bluff you are just trying to get value from some random pairs or gut shots and you are preventing a situation that the pfr can barrel u of ur hand on later streets. Raising makes ur decisions on later streets easier.

2nd Hand

I don't think you can ever call here profitably given the size of his raise. You are gonna whiff a lot and he is gonna barrel a lot too if he is a solid reg. Preflop i would either 3 bet or call, but i would 3 bet a lot more than calling. Your relative position sucks. If UTG raised and got one caller i would call, but in a potential HU pot and with a squeezer in the blinds i would go for a 3bet and might even fold if he squeezes really often rather than calling.