Hello I put some hands from today game on ggp

First one opponent often open raise/3bet so I decide call here on flop I catch nut flush draw and I prefer check-raise here than check-call because on ggjoker too hard get flush complete and I can throw hands like JJ-TT and vs Qx/KK I have nearly coin flip.

In 4bet we can fold here Jacks having overpair and open ended?

On button sit maniac do easy call here preflop?