Finding a useful book during an adventure is very rewarding for players. However, creating useful books for players to find is not so easy.
Here are 20 books set up as items to award to your players when they are scouring bookshelves.
Example:
Carnivorous Gardening
Magical Adventuring Gear, Common (requires attunement 1 week)
Weight1 lbs.
Value150 gp
Quantity1
This book gives advantage to Nature Skill Checks that pertain to dangerous plants.