[papawawa]

Welcome to the forum.
First, examine the situation. Check the texture of the board; what possible draws are out there? Well, a three straight flopped including two suited cards giving the possibility that the others have an open ended straight draw and/or a flush draw. The turn card was an uber-scare cards as it completed a possible flush AND the OESD. This is your oppertunity to steal the pot. By being aggressive and betting into a scary board, weak opponents who don't have anything might fold thinking YOU have made your hand. This is especially true b/c you showed strength on the flop. If you are raised on the turn, you can safely fold right there and save your bets (you were going to call a bet anyway, right?) Despite this, it seems to me that SB made something and was planning to check-raise if you bet the turn, but since it was checked through, he will now bet the river. This is a very bad spot to raise as you most likely have made the second best hand. Good luck on future rounds.