Some people like to donk in the beginning to get chips. They donk with thier group until they have enough chips. It is true a good bluff with the check raise when you see an ace after flop is good too. Bluffing
o.k., donking is'nt. The only way you tell the difference is you do'nt do it often. donks just keep doing it. A bluff is a well placed bet at your point when the dealer button could be a win.