Daily quests are a set of challenges that you can complete to earn rewards. Make sure to log in and play every day to claim your prizes!
To access your daily quests, tap the shield icon at the upper right corner of the main menu.
The progress bar at the top of the screen measures your Feat. You gain Feat by completing quests. Once you have accumulated 100 Feat, you can claim a prize by tapping the gift box icon located at the end of the progress bar.
You can choose one of four different prizes: Champion Shards, Skin Shards, Weapon Shards, or Universal Talent Stones.
For more information about Shards, read this article.
For more information about Universal Talent Stones, read this article.