Hold'em table

Pocket aces on the button; raise for value to build the pot against two players.

J9s is a playable big-blind defend against a button open, and calling 300 into 550 keeps the pot small enough to realize suited equity.

Middle pair with a weak kicker and only a backdoor diamond draw is not strong enough to lead into the preflop raiser. Checking keeps the pot small and lets me react to a c-bet.

Overpair on a dry-ish board with a check to me; betting for value and to charge draws.

Middle pair of jacks has enough showdown value and pot odds against a single c-bet to continue, but it is not strong enough to raise out of position.

I have second pair with a weak kicker on a king-high board after the button showed strength preflop and on the flop. Checking controls the pot and keeps my showdown value without bloating a marginal hand.

I have top set with an overpair to the board; betting for value on the turn against a checking opponent maximizes value while protecting against draws.

Middle pair with a weak kicker is too thin against a three-street barrel, and calling invites a larger river bet with poor reverse implied odds.

87s is a playable suited connector in position; a standard 3x open applies pressure and can win blinds or build a pot with implied odds.

J9o is too weak to call a button raise out of position with the big blind still to act, so folding is the highest-EV line.

KQs is strong enough to 3-bet for value against a single raiser, especially with the SB already out of the pot.

Facing a 3-bet to 900 with 8c7c, I lack the equity to continue profitably against a strong range, and my suited connector plays poorly without a cheap entry. Folding preserves chips for better spots.

T4o is too weak to call or open from the button in this three-handed pot; folding preserves the full stack.

7-5 offsuit heads-up vs BB is weak; folding SB to avoid a marginal spot for small cost is fine, but calling 50 more into a small pot with weak suited connector 75s is close - I'll just fold given poor equity realization out of position.

4c7c offsuit is a weak hand from the button; not worth calling here.

Pocket tens is a strong hand heads-up against the BB; raising for value and to build the pot while denying the BB cheap odds.

Jack-three offsuit is too weak to continue against a raise for 200 more; folding preserves chips.

A7s is a strong button opener in a 3-handed game; raising to 3bb builds the pot with position and fold equity.

T7o is too weak to call a button open out of position for 2.5bb more.

89o offsuit facing a raise from the button is a weak holding; folding is the standard play here rather than defending marginal cards out of position.

75o is too weak to open from the button in this three-handed spot, so folding avoids putting chips in with a dominated offsuit hand.

J3 offsuit is weak heads-up vs BB with a fold already from button; not worth completing given poor equity and reverse implied odds.