Like most free-to-play games, clumsy ninja incorporates a variety of currencies that you will amass along your journey to help the protagonist.
As in many other games, XP stands for Experience Points. You accumulate these as you interact with your ninja, complete challenges and train. Some items are better for gaining XP than others, and you can use the Items section of this guide for further information on the most economical way to do this.
Coins are the basic system of currency in the game. They are used to purchase pretty much every item in the game. You generally earn coins for completing training tasks and quests, but you also earn them once you have reached Level 10 and unlocked animals. Finally, you will also earn Coins by logging into the game every day and receiving the Daily Bonus that comes with it. You only earn the Daily Bonus by putting the ninja to sleep on his mat once per day. Don't forget, as with all these sorts of games, you can purchase Coins using real money if you really want to get ahead.
the premium currency in clumsy ninja is Diamonds. These are rarely found in the game (though still more often than in most free-to-play games). You use Diamonds to speed up any of the actions in the game, such as repairing items or even completing quests. They are earned mainly from Leveling Up, though you can also get them occasionally as part of Daily Bonuses or through promotions - such as linking the game to your Facebook account.