Here are your options with a minimum (6-10 point) hand:
The Single Raise. You may raise your partner's major suit with 3-card support (or preempt with 5-card support):
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Bid a New Suit at the 1-level.
You may bid any new 4-card suit at the 1-level, starting with the lowest 4-card suit you have:
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Partner should raise if he also has 4 hearts (since he knows you have an 8-card heart fit).
NOTE: You may not bid a new suit at the 2-level. Such a bid shows a stronger hand.
Raise Your Partner's Minor.
Since a 1 or 1
opening usually shows
a 4-card suit, you need 4-card support for a raise:
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Also, you should not raise your partner's minor if you have any 4-card majors: bid them first.
Bid 1NT.
You may bid 1NT if your hand does not fit into any of the above categories:
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This is a catchall bid to show that you have enough strength to respond, but not enough to bid at the 2-level.