How to improve my Library Level?

To improve your Library level you basically just have to buy and collect books, it's that simple. =)

After buying a new book, you will see the new experience progress at the bottom of your screen. As soon as you fill up the progress bar you should see a short level-up animation, congratulating you for your achievement.

Please note that each book is giving you a different amount of progress to level up the Library, depending on their rarity.