These aren't hands that I've experienced, but I'm going through some training for a live session this weekend and wanted to walk through some hypothetical spots and to increase my thought process.

Game is 2/4 NL full ring (10p)
Table is quite loose with 2 tighter & better players to my right. No option to move.

Hand 1:

Hero has T T in MP
UTG folds, tight villain in UTG+1 opens standard to $20
Folds to hero...

Tight Villain is opening this early with {77+, AK, AQs, KQs}
Without my pokerstove powers I'd guess Hero has ~40% equity here?
Hero: $350
Villain: $500
My inclination is to 3bet to $60, folding to any 4bet/shove.

If it folds around to him and then if he flats and we see a flop... (Pot $126)
-If it's top-heavy (AKQ etc) and he checks to me, any c-bet I do pretty much commits me. Nevertheless, I'm behind most top-heavy boards here, can check/fold. If I flop overpair I can commit, bet flop, shove turn, etc.

Thoughts?
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Hand 2:

Same game, hero is in CO with JQ , very loose player opens to $20, tight players fold, 2 callers, hero decides to call. Rest fold.
Opening range: {22+, ATo+, KTo+, A2s+, K2s+, 45s+, KJ, QT}
Pot is $86.
Hero: $400
Eff. stack (PF raiser): $150

Flop is:
Q T 8

Coordinated board, hits the looser players calling ranges somewhat.
Opener cbets $30
1 caller, 1 fold, hero?
Pot is $146, raiser has $120 behind. Have seen him cbet very often.
Thoughts: Hero has TPMK and a weak draw. Raising looks good here, as I'm dominating PF raisers range, and the caller hasn't shown any strength yet.
-Hero raises to $90...If raiser calls/shoves, hero calls obv.
-Hero raises to $90, if they both call...(lol) raiser will shove any turn, depends what other caller does here...

Thoughts?

Hand 1, I'm flatting pre-flop like... basically always. It's pretty standard to flat with TT in most spots. I would only 3bet if the pre-flop raiser is quite loose and will call wide, or stack sizes/ranges are such that I'm happy getting it in pre. Also possibly if there is a bunch of dead money in the pot already and I'm OOP.

Hand 2, What are the effective stacks with you and the player in-between? If it is also $150, the just shove. I have no idea why you would only raise to $90. It's going to be a high variance spot, but given the small bet size, you should be ahead the vast majority of the time.

Edit: I play in 200+ bb games almost always, so with stacks being so short, 3betting with TT and just getting it in may also be fine. 3bet folding kinda seems bad.

Both hands seem like pretty standard flats.

Hand 1 require a pretty loose opener and/or some 3!ing dynamic, and even then, there are a lot of reasons why I might want to flat.

Hand 2 we're IP with a marginal hand that likes a lot of turns and dislikes a lot of other turns. Let's flat and see the turn and two more actions before we decide to commit stacks.

Hand 1: Agree with above, just call and see what happens. 3betting TT vs a tight EP opener in most of my games would just be turning a decent hand into a bluff.

Hand 2: Flat this and let your positional advantage work for you. Like hand 1 raising is effectively turning your hand into a bluff against a lot of players. However if opener is a known whale and player in-between is weak-tight then I'd shove for value against the whale and expect to fold the guy in the middle. If the guy in the middle is tough and tricky though he might be expecting (hoping?) you to try to isolate the whale with a lot of your range here and be setting a trap.

by 3betting TT against a tight raiser, you are isolating his continuing range to be hands that are crushing you. Instead of getting better to fold and getting worse to call, you accomplish the exact opposite - worse hands fold and better hands call.

Poor players do this because it makes the hand "easy to play". But it doesn't win the most money.