Hold'em table

9h4s is a weak offsuit hand with no connectivity; folding on the button facing a raise-limited pot is standard.

Calling the 50 big blind with 7h9d suited-ish connectors is reasonable to see a flop and play position, as the cost is small relative to the pot and stack.

Button folded and the small blind only completed, so I raise JTs for value and to build the pot in position rather than give a free flop.

7h9d is a weak disconnected hand, and facing a 400 raise from the button with only 100bb effective, the pot odds don't justify a call. Folding preserves my stack for better opportunities.

I have a suited connector in position and the pot odds justify a cheap call to see a flop. Raising is possible but I prefer to keep the pot small with this hand.

J6o is too weak to complete from the small blind even after a button limp; folding avoids a dominated, poorly playable hand out of position.

T7 suited is marginal; with a limper and free option, checking to see the flop is standard.

Board is heavily flush-drawn with three hearts; my pair of sevens is only medium strength, so I check to control pot size.

Board is a flush draw with my 7d giving me a pair and a backdoor flush draw; checking preserves pot control and avoids building a big pot with a marginal hand against an unknown range.

I only have bottom-ish pair with a four-flush board out there, so I'll check to keep the pot small and avoid running into a flush.

Board is a flush draw heavy with four hearts; my 8c 7d is weak and vulnerable. Checking keeps the pot small and avoids building a big pot with a marginal hand.

Board is a five-card heart flush (K-high), so I automatically play the nuts unless opponent holds the Ace of hearts; checking to showdown is safest with no information suggesting I should bet.

The board is a flush-heavy river with no pair, and my 8c7d is a weak high-card hand with no flush draw. Checking keeps the pot small and avoids putting chips into a likely worse spot.

J9o is playable from the button in three-handed poker with position, so a small 2.5bb open is better than folding.

Weak offsuit low cards facing a raise; not worth continuing from the small blind.

3c3s is a weak hand and I'm out of position facing a raise from the button; folding avoids a difficult postflop spot with limited equity.

On the button with a decent hand (K7 offsuit) in a 3-handed pot, a standard raise to 250 applies pressure and builds the pot with position advantage.

I have 5s6c, a weak hand with no playability. The raiser has position and initiative, and I'm out of position in the small blind with only 200 to call. Folding preserves my stack.

J4o is too weak to continue against a button open; folding avoids paying 150 more with a dominated, unconnected hand.

I hold 2s9c, a weak offsuit hand with no playability. The small blind has already invested 50 and the big blind 100, making a call of 100 to see a flop with this hand a poor expected value decision.

Q7o is too weak to continue out of position after the button folds; calling or raising leaves me dominated and poorly placed against the big blind.

A7o is playable from the button in a three-handed pot, and a standard 3x open applies pressure to the blinds while keeping the pot manageable.

2s9s offsuit-ish weak hand facing a 3bb raise; not worth calling out of position for 250 more.

6d 5h is weak and unsuited; facing a 300 raise with only 200 to call, folding preserves my 100bb stack for better spots.