OK these are two concepts I think I'm having trouble with. Firstly 3 betting AQ... is it ever the "correct play"? It seems whenever I 3 bet AQ im either dominated (AK,AA,KK,QQ) or coin flipping (JJ/TT). One particular time in a 9 person SnG it got folded around to blinds (I was in BB). SB raised me standard. I re-raised all in with AQo. He called with AKo. Was this right? How should I play AQo with raises behind me?

Also, continuation betting. Commonly I'm in situations where I have something like AK or TT and flop comes with overcards/ I miss my pair. The main problem here is when there are 4+ people in the pot so it seems I'm just throwing money away... what's the maximum number of people in the pot for a continuation bet to be profitable?