Choosing a c-bet size
L4 Postflop / Postflop c-bet
Ahead across your whole range: bet small. Holding the very strongest hands too: bet large.
Bet large without the nut advantage and only the hands that beat you stay in.
The verdict here comes from a simplified model, not from a solver.
c-bet
A bet on the flop by the player who raised before it. It continues the story their preflop raise told.
SPR
Stack-to-pot ratio: how many pots you still have behind. Low SPR means the hand resolves quickly; high SPR leaves room to manoeuvre.
range advantage
Whose set of possible hands does better on this board, averaged across all of them.
MDF
Minimum defence frequency: how often you must continue against a bet so that betting any two cards would not automatically profit.
20 hands or more, with an optimal rate of 50% and average EV loss no worse than 0.25BB