Enchanted books are a useful item in Minecraft for enchanting items in the game. So if you want to use an enchanted book, you will first need to craft an anvil. You can craft an anvil with three blocks of iron and four iron ingots places in the following order inside a crafting table.
Once made, simply place it down anywhere in your base, and you will then be able to use it with enchanted books. To use the anvil with enchanted books, right-click the anvil and put whatever book you have on hand, such as looting or unbreaking, inside the first slot of the anvil.
Now find an item you wish to use to make an enchanted item, and all there will be next for you to do is use a required amount of experience to enchant your item. Don't worry about how much experience you will need, as it will be a lot less because enchanting items inside the anvil has a reduced cost.
You can also combine enchanted books with other books to create larger ones that can enchant items with multiple enchantments. To do this, simply place one enchantment book you want to combine with another in the first slot and then another. After that, it's a matter of using CP points like with other items, and after you enchant your second book with the first, you will create a book with multiple enchantments.
For more on Minecraft, check out How Long Does it Take for Copper to Oxidize in Minecraft? and How to Get Calcite in Minecraft