Hold'em table

Pocket fours are ahead of most button opening ranges in a three-handed game, so a standard 3bb open builds the pot and takes the initiative.

QTo is strong enough to defend the small blind against a button 3bb open, with position on the big blind still to act but good pot odds.

J4 offsuit is a weak hand facing a raise and a call; folding is correct to avoid investing more with poor equity.

Q-high with backdoor straight and flush draws has little value on a paired Jack board; checking keeps the pot controlled and lets me realize equity cheaply.

Pocket fours have a little showdown value on a paired jack flop, but they are too weak to bet for value and a bluff is unlikely to fold better. Checking realizes equity for free after the opponent checked.

With Q-high and an open-ended straight draw on a paired board, checking keeps the pot controlled and lets me realize equity for free after the flop checked through.

Pocket fours make two pair on a paired board and are ahead of unpaired hands; seat 2 checked twice, so a small turn bet gets thin value and protection.

Calling 300 into 1000 with an open-ended straight draw to the 8 or K; the small bet plus implied odds on the river make continuing preferable to folding or raising out of position.

I only have a pair of Jacks with a Queen kicker and lose to most Ace/King-high and paired hands at showdown, so checking likely loses. A river lead credibly represents the completed spade flush after my turn call and can fold out better kickers and two-pair hands.

Pocket fours are only two pair with the board jacks and lose to any jack, flush, or higher pocket pair. Folding the river bet is the clear choice.

K5o is playable on the button in 3-handed play; raising applies steal pressure on the blinds while keeping position if called.

4-6 offsuit is a weak hand facing a button raise; folding is correct since it's not worth defending from the small blind.

K9 offsuit is too weak to continue out of position against a button open, so I fold rather than call 1.5bb more.

6-10 offsuit is a weak hand not worth entering a 3-way pot from the button for a raise.

69 offsuit is too weak to continue out of position heads-up; folding the small blind avoids playing a dominated hand.

J3 offsuit is too weak to open even from the button in a three-handed game; folding avoids putting chips in with a dominated, poorly connected hand.

KQs is a strong suited broadway heads-up against the big blind after the button folded, so I raise for value rather than limp or fold.

J6 offsuit is weak against a raise with only one opponent left; folding is cheap here.

K7 offsuit on the button in 3-handed play is well ahead of the blinds' ranges, so I open-raise to pressure them and take initiative.

42 offsuit is too weak to continue against a button open; folding saves the extra 150.

Button with weak offsuit-ish holding (T3s with disconnected ranks) facing a raise-sized call in a 3-handed pot; not worth continuing, fold and wait for better spots.

Q7o is weak but the button folded and I only need 50 more into a 150 pot against a random big blind, so completing is the better price than folding.

Td4s is weak offsuit, but checking in the big blind costs nothing and lets me see a free flop heads-up against the small blind limp.

Queen-high with only a backdoor diamond draw on a paired board has little value, so I check and avoid bloating the pot.

Heads-up after opponent checked, I have a pair of 9s with a ten kicker plus a diamond flush draw. A semi-bluff bet can win the pot now and builds value if the flush completes.

Queen-high with only a backdoor flush draw has poor equity against a flop bet on a paired board, so calling is not justified.