I understand it's frequently ok to bet a flush draw from OOP. When it's ok? I've noticed many decent players make a re-raise with TPGK if they noticed a flush/straight draw on the board. In what situations you would want to call the re-raise (please give me an example about odds or something)?. What about after calling that re-raise? Keep on firing if I missed the draw? What about if I hit the draw, is it ok to attempt a c/r or is it too obvious?

Just a couple of questions.