You've opened 1-of-a-suit but don't have a minimum (about 12-14), but neither do you have a maximum (about 18-20). You have to choose a rebid. With that in-between range, opener won't have a balanced hand (would have opened 1NT with 15-17 balanced). So, your possibilities are: 1) Jump rebid your suit (6+ card suit, roughly 15-18 in playing strength) 2) Jump raise your partner (4-card support, roughly 15-18 in playing strength) 3) Bid a new suit (very wide range). For 1
-1
-2
you could have a dead minimum, but could have up to about 17 or 18 (because 1-1-3 would be GF) .
Note: In #3, "Bid a new suit" does not refer to a jump shift (GF) or a reverse (forcing one round).
AQ76 
AQ54 KJ43 2
What is your rebid after you open 1 and partner responds 1?
1
2
2
3
4
4
AQ765 AKJ3 Q43 2
What is your rebid after you open 1 and partner responds 1NT?
Note: It doesn't matter how you play the 1NT response
2
2NT
3
Other
A3 A5 Q65 KQJ1052
What is your rebid after you open 1 and partner responds 1?
2
2
2NT
3
3
3NT
AQ76 A2 KQ10765 J
What is your rebid after you open 1 and your partner responds 1?
1
2
2
3
Other
A2 KQ108 AQ108762 --
What is your rebid after you open 1 and partner responds 1?
2
2
3
3
K2 KQ73 K2 AJ543
What is your rebid after you open 1 and partner bids 1?
1NT
2
2
2NT
3
I wouldn't open 1
Other
K65 KQJ53 -- AKJ98
What is your rebid after opening 1 and partner bids 1?
2
2
2
3
4 (splinter bid)
Other
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