Help!!!!

OK im new so I have no clue how to play this game.I only know the basics of playing like:
1. Games can earn you money
2. You can buy things
3. Can collect avatars
4. Can adopt pets (12 max)
5. You can train pets
6. Battle cards using pets
6. Can buy things from auctions

But other than that how (or what) can you do on this site?

Like:
1. What are galleries for?
2. How do you get Dukka Coins?
3. What are mini pets for?

Stuff like that.