In Aura Kingdom 2 there are three like skills you can master. These are fishing, blacksmith, and alchemy. These skills come in the form of mini-games and give you the opportunity to grind rewards that are useful in crafting gears. They also enable you to earn a gold chest containing blueprints of different quality rings. These mini games become unlocked naturally through progression of the game. Once reach chapter 7 you will have access to all three mini-games.
Note: All three mini games can only be played a certain number of times a day.