thanks guys
I don't like JJ very much. If I raise it preflop I often get in trouble.
Like today:
Dealt JJ and I bet 4xBB and get 3 callers. Flop comes TT6 and one guy bets the pot and one other calls. What do I do? (Read on first better: dangerous player, loose aggressive -hard to read his hands).

I fold because of the second player calling. I smell a set, and I had a bad poker day so far and was playing extra tight, but it turns out first guy is playing a TT66 and the other is just bluffing and end up loosing half his stack to the TT66...So I chicken out to easy with JJ.