Thanks,
Peter
After 1H by you – 2D by partner, here are the meanings for your second bid:
Rebid of your major (2H) = Minimum (12-14 pts.). This may be only 5-card suit if your hand is unsuitable for 2NT (weakness in an unbid suit) or a new-suit rebid.
2S = Extra values (15+ pts.) and a 4-card suit.
2NT = Balanced minimum (12-14 pts.) with stoppers in unbid suits OR 18+ balanced.
Non-jump bid of 3 of a new suit (3C) = Extra values (15+ pts.) and a 4+-card suit.
Raise of partner’s suit (3D) = Extra values (16+ playing points) with support (4+ cards).
3 of your major (3H) = Extra values (14-15+ pts.) and a strong 6+-card suit.
3NT = Extra values (15-17 pts.) with balanced distribution.
Jump in a new suit (3S or 4C) = Extra values, good support and a singleton in the suit bid (splinter).
Jump to game in your major (4H) = Minimum (11-13 pts.) with a long, solid suit.
4NT = Keycard Blackwood for partner's suit.