Hold'em table

Q8 offsuit is too weak and easily dominated to open or flat from the button, so folding preserves chips.

Facing only the big blind after the button folds, raising to 3bb with an Ace allows us to take initiative and attack the dead money.

72o is far too weak to defend the big blind against a 3x raise, even getting a small price. Folding and preserving chips is clearly best with no hand worth playing.

T3o is too weak to open on the button, even in 3-handed play.

AJo is a strong heads-up hand from the SB; raising builds the pot and applies pressure on the BB.

57o is too weak to continue out of position against a preflop raise, so folding is the highest-EV option.

A3s is a playable suited hand on the button in 3-handed play; a standard 3x open builds the pot with position and applies fold equity to the blinds.

Q9 offsuit is too weak to continue out of position against a button raise, especially with the big blind still to act. Folding avoids a dominated, low-equity spot.

97 offsuit is too weak to defend out of position against a 3x button open.

K2o is too weak and dominated to open from the button; folding avoids a poor spot.

Holding pocket eights in the small blind after the button folds, raising for value against the big blind is standard.

Ac2o is dominated by stronger aces in the small blind's raising range and plays poorly out of position postflop. Even with decent pot odds, folding avoids tough multi-street spots with a weak-kicker hand.

Opening T9s on the button in 3-max is standard for value and playability.

52s is one of the weakest hands and I'm facing a 2.5bb button raise with the big blind still to act behind me. Calling out of position with no equity edge just burns chips, so folding is clearly best.

K9o is too weak and dominated to continue out of position against a button open, so folding preserves chips.

JTs suited-equivalent connector on the button; raising for value and position, folding is too tight.

Q2 offsuit is too weak to call a button raise out of position for 250 more. Folding preserves the stack for better spots.

K2o is too weak to defend out of position against a 3x open from the button.