1S - 2S;
2N

Opener asks for responder's short suit by rebidding one rank above agreed trump suit. Responder's new suit shows a singleton or void, otherwise rebidding trump suit

1S - 2S;
3C

Opener's new suit rebid shows a short suit by opener (showing, not asking)

1S - 2S;
3C/D/H

Shows a short suit by opener (second step or more)

1S - 2S;
2N - 3C

Opener's 2N (first step) asks responder to identify a possible help suit implies opener's hand may be suitable for 3N.  Here, responder can help in Clubs (up the line)

1S - 2S;
2N - 3D/H/S

As above, here responder cannot help in Clubs and bids 3 of major with no further help

1S - 2S;
2N - 3C;
3D/H

As above, here opener offers a counter acceptance asking for help in a red suit

1S - 2S;
4C/D/H

Shows a secondary 5 card suit by opener

Promises short suit, forces* 3C (puppet)
Diamond singleton
Heart singleton
Club singleton

* But can instead bid own short suit.  If the auction begins 1H - 2H, then 2S typically replaces 2N in the above auctions

1S - 2S;
3C/D/H

1H - 1H;
2N/3C/3H

Shows a long trial suit by opener

Same (2N = Spade shortage)

1S - 2S;
2N - 3C/H

Shows acceptable game try suit by responder

1S - 2S;
2N - 3C;
3D

 Opener counter acceptance suit

1S - 2S;
2N - 3D/S

Denies lower suit, shows acceptable game try suit by responder

1S - 2S;
2N - 4C/H

Slam try - shortage in bid suit

1S - 2S;
2N

Promises a short suit, forces 3C (puppet)

1S - 2S;
3C - H

Shows a long suit by opener