-5 handed opening is fine

Flop
- Its a bet flop for me, he probably 3bets AJ+ KJ+ Ax suited . With no reads I think a default is to bet.
Turn
- Doesn't make much sense to bet now, if you had a flush draw you would have bet flop. Your hand looks like a slow played Kx or a Qx. I suspect most of your under pairs would continue to pot control on this sort of board?
- When he raises the T I hate my life if I was in this spot. What is he bluffing here, the boards wet and your range looks capped.
- AJ unlikely because you have a blocker
- A10 is a possibility with the ace of spades or he has the nut flush
- QK very unlikely its a value raise with this hand, because you block it and i think this could be a 3bet pre flop.
- I think I fold the turn with no reads
River
- He leads out, basically screaming I want value so you do not check back for a cheap showdown

Flop: versus unknown I'd bet. Question for me is, if you think a bet would be better, why check versus an unknown? What were you trying to achieve with a check?
Turn, as above, I can't see a reason to bet here most times. He does this and he 'probably does that with XX or XY doesn't work for me here versus an unknown, just too assumptive unless that's a general unknown population read.
River: ok so you called the turn, why do you have to call the river? Because some video you watched said so? They may have more info than we do here.
In my opinion that's too assumptive again and we're thinking villain can bluff turn and river, but we have no information on villain so this is a total guess on our part.

Fold turn for me. At these limits a turn raise is very very rarely a bluff.

River: no call for me even if I did call the turn, If I was right this time it will lose money longterm.

Seriously, I'd try not to play too much fancy poker versus these guys, keep it straightforward and they'll tell you soon enough if they have you beat (see your own post) Oh and fold a LOT to those turn raises, even minraises.

Just what I think is all, I'm no end boss!

think you went wrong when you thought about his turn c/r range. When he calls SB he shoudlnt have many JTo ATo, AXo. So he dont have that many great draws to c/r here. think ur line is fine checking back flop and betting turn. Vs c/r we can either defend this as top of our range or we can call when we have Kx or flush if you decide to check back some hands like that from the flop.