A9o on SB vs BB in a limp pot

The first question is Why do you raise the turn?

I mostly try to be disciplined and fold this hand preflop because now the A comes OTF, we don't know where we stand because there are so many combos ahead of us when villain starts betting. Turn should not be raised here indeed.

It is a limped pot and multiway, your hand need a lot of relative strength to win a big pot.
Here with top pair weak kicker you can only win a small pot or loose a big one.
I think you should try to find some resources explaining how SPR affects the required strength your hand need to able to put chips in the pot

I mostly try to be disciplined and fold this hand preflop

I think it's fine to call per flop as long as you play post correctly, which in this case is not very hard, we are bluff catching play check/call keep them ranges wide.

The martini-drinking dog is right on the spot.

Utter care is needed postflop. I'd read BB for a better hand than ours because he is in awful position and still bets. There's no chance in hell that a raise is right on turn (unless you are bluffing, which is merely bad, but not abysmally bad, with TP)

Also, turning down 7:1 in pot odds preflop (with 600:1 in maximal implied odds) is hard (with any two). But with shaky postflop play, a fold is best. Squeezing would be awful with shaky postflop play. Now you stand to lose a stack if called. You play to win a big pot by flopping a very big hand, or to take down a medium (trips or top two) or small pot (TP). You can mostly forget about artful play (thin value and bluffs) when it starts out 4-ways.

I was not aware that I played this hand like shit
Thank you for all your comment

@nitrol
always can learn by your questions, it makes me think ♦
I bet on the turn, because on a 10BB pot I evaluated villain's 3BB raise a minraise, therefore I bet 3x size of his raise. But really I would not expect him to call, so it confused me

@SuperChompa
I did not even think about Stack to Pot Ratio in this situation (and really I never ever had a though about that). Can you recommend some resources for me?

@YohanN7
I really don't know the 'martini-drinking dog' discipline either
I think BB still might have any hand, since this is a limped pot. In case I am in a BB, I also donk the flop, most of the cases it works. The difference is that I mostly give up if I get called and don't hit Turn, but never bet 1/3 of the pot.
Good advise at the end (at least for the moment)

I mean that with the raise you do not achieve anything useful but make the pot large. Your hand is not the one for big pots...

When Yohan says martini drinking dog he is talking about me

It is tough to explain here in few lines. But I will try to give you some examples

Relative strength is where your hand stands depending on the community cards, from having the nuts (eg: A high flush on not paired board, top set on very dry board...), to having some marginal holding say (top pair w/ bad kicker, middle pair, ...), or some middle strength hand (top 2 pairs on board with possible straight).

SPR you can easily find the definition on this website I guess but say:
13 is single raised hu pot: to go all in you need very close to the nuts, says if there is 3 cards of the same suit on the board, you probably need at least Q high flush.

4 to 2: 3 bet pot, usually if you are able to beat an TPTK/overpair, you are going to be good.

1 to 0.5: If you hit top pair/ any overpair most of the time you have to go with it.

Here you SPR was more than 30, so IMO check raising range on the turn has to be at least a set, may be two pairs if you play aggressive.