Bidding 2♥, shows a minimum hand (6-9 points) with long ♥ (normally 6 cards).

3) What's your rebid?

Bidding 1NT, shows 6-9 points or 10 points with bad distribution. It also shows that you don't have a fit with partner.

Don’t bid 2♣ (4th suit forcing); this would show 13+ points and doesn't necessarily show Clubs.

It's also not good to rebid ♥ with 5 poor cards as partner might not have any Hearts or just a singleton.

4) What's your rebid?

Bidding 2NT, shows 11-12 points or 10 points with good distribution. It also doesn't show a fit with partner.

Don’t bid 2♣ (4th suit forcing); it would show 13+ points and doesn't necessarily show Clubs.

Also, it isn't good to rebid ♥ with 5 poor cards as partner might not have any Hearts or perhaps just a singleton.

5) What's your rebid?

Bidding 3♠, shows 10-11 points and a fit with partner (bidding 2♠ show only 6-9 points).

6) What's your rebid?

Bidding 3♦, shows 10-11 points and a fit with partner.

You first bid, 1♥ looked to find a possible ♥ fit, but when partner didn’t support your Heart, it means it's time to show your support in Diamonds, at the 3 level (as 2♦ would only show 6-9 points).

Also, remember that partner's 1♠ rebid shows 4 cards (they didn’t open 1♠) so to support Spade you need 4 cards.

7) What's your rebid?

Partner is showing 12-17 points with at least 5 cards in Spades and 4 cards in Diamonds.

Your 2♠ bid at this stage is just a correction, showing no more than ♠xx. If you had had ♠xxx, you could've bid 2♠ instead of 1NT.

2♠ here is also telling partner that if they insist on playing in their suit, then it would be better play in Spades (a correction bid).

Don’t bid 2NT, as partner most likely will prefer to play in a suit.

8) What's your rebid?