There are two types of quest in the game: Daily Quests and Weekly Quests. Both types of quests present special challenges for you to complete for rewards. The rewards obtained from quests will help you progress on the Battle Pass.
As you make progress on the Battle Pass, you will earn additional rewards, including coins, gems and chests. The free Battle Pass offers standard rewards, but you can also activate the premium Battle Pass, which grants access to faster progression and additional rewards.