BU A2 bottom pair

Tough decision. This is basically a spot where you can play postflop in many ways. Personally, I think barreling to make him fold hands like 33-66. Apart from that, winning the pot now vs hands like QT, T9 is also a nice result plus he probably floats once some A high which he can still fold. Basically, I think your hand is too weak to check turn and bluffcatch river too often. It can be done with some reads but I'd treat it as a semibluff.

The J on the turn sucks since it should decrease your FE but I still think if you combine the FE and potential value from T9s, AT type stuff you have a +EV bet and you get to check rivers quite often when you choose so.