How can I obtain and use coins?

There are various ways to obtain coins. These ways are:

Opening the Area Chest
Completing Bonus Levels
Beating normal, hard, and super hard levels
With the remaining moves at the end of a beaten level
From events like Propeller Madness, Book of Treasure, Team Battle, Team Treasure, Balloon Rise, Pinata Party, Lava Quest, and Royal League.
Purchasing coins from the Shop

You can use your coins to: