OK so I'm pretty sure I butchered this hand quite badly. (Some of the board/my hand might be slightly wrong) It was online but no HHC and doing it from memory.

Hero has J J 4 5

UTG+1 raise 1.5BB, BTN calls, Hero calls in BB.

Flop (5BB) : Q T 9 (2 diamonds, one other suit but can't recall which were diamonds and what other suit was)

Hero check, UTG+1 check, BTN bets 3.75BB, Hero raises to 10BB, UTG+1 folds Villain shoves 31BB more, 21BB to Hero. I fold.

Is pre OK? I don't think it can be too bad to call providing I don't butcher the hand post-flop like I did this time. Flop I guess leading out is the best play. I can 3barrel bluff if board runs out blank and I have some equity to go along with my blocker. I don't mind if I'm raised and have to fold either. I doubt villain is betting this board that light and when I c/r I leave them limited options of shove/fold with them shoving a fair bit. And then I don't know if I have the right odds to call.

pre is fine.
as you said, flop is a good spot to lead, or, just c/f as played... you don´t need to win every fight.

Lead or c/r - depends on villains. Sometimes c/f though it's a nice hand to bluff. Size the cr higher, especially on this board.

GRUNCH

I think pre is fine but with your effective stack you need to flop a set not a multi street bluffing opportunity. If you were 100 BB deep I think leading is ok if your going to 3 barrel all blanks. I find myself doing less and less of these plays OOP cuz I think it is an unnecessary risk. I mean you have a hand with low showdown value and are hoping to dodge a lot of outs. As played on flop with your stack I don't really like it, I think it's FPS.

I'm a fan of leading and x/f once you didn't. Think you have to fold to the jam as well.

I sized the raise like this for a few reasons but the most important one is villains stack size means he probably jams/folds mostly and I'd be sizing all my value hands this way. If he does just flat then the pot size is perfect for shoving OTT.

Also I don't want to price myself in to call in case I get shoved on.

I think this board is so coordinated we should c/f because we wont get enough folds. I don't think any other option is +ev.

Flop play depends on opponent obv, c/f mostly w Jd. However, I dont mind go for a triple barrel with the blockers except if V is a station. It wouldnt be very wise then.

Turn, the range of V for doing this looks like : TTK*, KJ**, QT**dd, Q9**dd AdKd**,AA**dd, KK**dd (I probably forget some..) and we have ~28.3% against this range. We need ~31.3% for calling so it's very close but I guess it's a sigh fold now..

Well, thats hard for me to know without stacks

"BTN bets 3.75BB, Hero raises to 10BB, UTG+1 folds Villain shoves 31BB more, 21BB to Hero"

OK so I didn't give stack sizes but am sure you can work it out from there!

Folding pre seems insane to me. Flop is interesting, I like leading as most everyone said, it puts UTG in a very awkward position. As played, its kind of a stupid spot given stack sizes. We can't really apply 3 streets of pressure here by checking so our blockers are basically useless if we check flop. I guess I c/c as gross as it might seem, it just seems like too much equity to fold, maybe more of a fold given utg is still in the hand can easily have a better flush draw if hes more passive with this c-betting on this board.