88 Second pair vs Fish, cbet on the flop?

Preflop: Since ur on MP it's ok to isolate (and for other reasons too)
Flop: Yep, you should have bet, no need to make it big tho

i am beting my FKING EIGHTS on this FUKING FLP!!!

Yes, cbet this. Only one overcard to your pair, you most likely have the best hand at this point. You want to get value from villains draws, overcards etc. He seems fishy, maybe calling station type - passive, not folding much. It's true that there is many cards you don't want to see on turn, so why make life hard for yourself and give free card and initiative to villain.

The Qxx boards can be attacked.

i would cbet Flop + Turn and check back river
This is my default play vs fish or vs reg because it is simple and keeps me out of complicated river decisions.
I bet and make the bets as large as I want. (half pot)
I get value from draws and i dont get bluffed and dont get into guessing games on river.
Dont even think in these spots anymore, just bet / bet. It is standard. Only deviate when you have a read that he x/r very much or something and he stabs like a maniac, in wich case i like the check back.

Other Reasons:
Cbet flop for value, worse hands call - like AK, A6, A5, 77, 78, 9T
Cbet Turm for value, worse hands call - like A:c X, 78, T8, T9 with a club

Preflop: Is it ok to isolate this hand vs a fish or it's better just limp?

What i would isolate IP is 89s+

Vs a fish 2nd pair is the nuts, so we should definitelly cbet this flop. As you said, there are many bad turn card that could come.

hi, thanks everyone. so, do you think it's better to fire a cbet, and a second barrel if turn's card its a blank?. for example in this board a 6 that paired and completed the flush draw it is bad card for keep betting, rigth?