TT Str8 ott facing 3 barrels

And he had a flush....

Raise turn.

I also think a raise OTT is a better line here. The only hand that would beat you is AT so you have more than enough equity here. We can raise for value. I'd call here OTR as well because his bet isn't high enough to lay down your hand and there are many TP and 2P you beat. However, now also the flush is luring so I guess you don't have that much equity anymore

What range you put villain OTT actually?

I believe Tx, random bluffs as he might percieve me as weak once I 3bet pre and check flop, so some Ahighs and few FDs and possibly few weak pairs turned into bluff. I didnt think he will barrel this turn with too many 2 pairs, thats why I decided to rather let him barrel bluff as I block Tx and T of spades.

Not sure my thought process Is correct here without reads, cause I am not yet too familiar with Avg field gameplay in cash games. (such as turning SD into bluff, barreling draws too much when u get c/r often etc)

It's not necessarily incorrect but rather incomplete IMO. Be aware that villain could even call your 3bet with AJo+, AJS+, JJ-QQ, 9Ts, JTs and occasionally AA-KK. His range is wider and he bet OTF. We can leave out hands like TT, JJ, AJ, AQ because those will not bet the flop so eagerly in a 3bet pot OOP. We can assume here TP+ and only JTs will have you beat. In other words, OTT you have more than enough equity with your hit straight (if we keep this assumption, we have over 80%) so we can raise for value here.

The topics you mention are all different but explained extensively on this forum by w34z3l but you would need silver status for that. Are you playing in a tracked room via PokerStrategy?