Opener opens in a suit and his partner responds on the 1-level. When Opener has a strong hand (16+), these are the choices: 1) Rebid 2NT = 18-19 balanced 2) Reverse (a 2-level bid in a suit higher than opener's first suit) = 17+ (Forcing 1 round but not to game) 3) Jump-Raise (Jump to 3=16-18 in support and jump to 4 = 19+ in support) 4) Jump Rebid = 16-18 counting shape and a 6+ card suit 5) Jump Shift = Natural and Forcing to Game 6) Jump to 3NT = Strong hand, typically a long running suit. If that's not enough to overwhelm you, note that occasionally opener won't do any of the above. 1-1-2, for example (opener's new suit) can occasionally be bid with quite a good hand, just short of a jump-shift. For example, opener would produce that auction with this 17-count:
5
A8765
AKJ
AJ42.
AQJ8
2
A2
AKJ876
What is your rebid after you open 1 and partner responds 1?
1
2
3
3NT
AJ107
A2
AQJ32
K2
What is your rebid after you open 1 and partner responds 1?
2
3
4
2NT
A2
AQ76
AK7654
2
What is your rebid after you open 1 and your partner responds 1?
2
2
3
3
Other
2
AQJ76
54
AKJ65
What is your rebid after you open 1 and partner responds 1?
2
3
3
2NT
AQ1076
K2
KJ2
AJ2
What is your rebid after you open 1 and partner responds 1NT?
2
2NT
3
3NT
Other
What is your rebid after you open 1 and partner responds 1?
A
K4
J109
AKQJ843?
2
2
2NT
3
3NT
5
Other