Bet sizing question

GTO bet sizes will depend on your specific solve and flop texture. They depend on stack sizes, flop texture, nut advantage, range advantage and board connectivity.

The minimum is 1 BB, maximum is your full stack. Nut advantage allows larger sizing, range advantage allows more frequent betting, dry textures are usually smaller sizings wet textures are usually polarized large sizings. Turns and rivers are usually polarized and allow overbet sizings.

For free simulation, see the wasm-postflop or desktop-postflop solver - https://github.com/b-inary

There is also another free solver, but it isn't as accurate, probably good enough though - https://github.com/bupticybee/TexasSolver

I recommend to focus on how to exploit the weakest players on the table. Best betsizes are the ones where you extract the most value or put pressure on opponent s range.

Weakest players will have a wide range and you should bet smaller on the flop against a full stack.
Against short stack you should be tighter because you can stack off easily OTT.

You can sometimes get people to call by betting fairly small — but how small?
If you have a strong hand, you want to bet something small enough to call, but not so small that you leave money on the table.

Sometimes bet sizing will get people to fold — that's OK if you want them to fold, but you also don't want to hand people your hard-won cash.

Online I usually bet [my raise x #opponents] and vary a bit by position and board with half a blind.
So if I raise to 240 and CO calls, rest folds, my flop bet will usually be 480 and that will most likely be 79% of the pot.
Therefor I usually tone it down by half a blind to 420 or 400. Seems to work most of the times for me.

Hidden 2 pairs or straights / sets do well in overbetting / overbet bluffing