Hold'em table

The button folded, so I'm in the small blind with 6-7 suited-ish connector (offsuit) heads-up against the big blind. Only 50 more to call into a 150 pot is a good price, so I'll call and see a flop.

Holding J7o in the big blind facing a small blind completion, checking to see a free flop in position is the standard, high-EV play.

I flopped a straight (6-7 with 3-4-5 on board), which is the nuts-ish holding. A small bet of about 75% of the pot keeps worse hands like pairs and draws in while still building the pot heads-up.}

Facing a 3/4 pot bet with just Jack-high and weak draw potential on a connected board, folding is clear.

AJo on the button in 3-handed play is a strong hand, so a standard 3x open raise is good value and puts pressure on both blinds.

J3o is a very weak unsuited hand out of position against a button raise, making it an easy fold.

43s is far too weak to call a 3x raise out of position heads-up; folding is clearly best.

J2s is too weak to open profitably even on the button in 3-handed play.

AJo heads-up vs BB is strong; raise for value and fold equity.

Q5o is a weak hand out of position against a small blind raise to 300, so I fold to avoid a marginal spot. Calling 200 more to win 600 is close on pot odds, but I would be out of position with a dominated hand postflop.

K6 offsuit is a weak hand even from the button in 3-max; folding preserves chips for better spots.

4-2 offsuit is the weakest starting hand; folding loses only the 50-chip small blind rather than playing a bad hand out of position against the big blind.

Pocket aces on the button in a 3-handed pot; raising to 3.5bb builds the pot for value against two players who still have to act.

Holding pocket Kings in the small blind against a button open, a standard value 3-bet to 1200 builds the pot out of position.

43o is nearly worthless facing a 12bb 3-bet; folding is clearly best.

Pocket aces facing a small blind 3-bet to 1200. Re-raising to 3600 builds the pot while leaving room for a shove from worse hands, and calling would also be fine.

Holding pocket Kings in a 3-handed game against a 4-bet, a 5-bet shove is standard for value and stack protection.

Pocket aces are the best starting hand, and the opponent's all-in shove leaves me getting about 2.1 to 1 on a call of 6400 into a pot of 13700. Calling is clearly correct.

83 suited is too weak to open raise from the button, even three-handed.

74o heads-up in the SB is too weak to call 50 more; folding is cheapest.