To achieve level 30 enchantment in Minecraft, you need exactly 15 bookshelves placed around the enchanting table. This is the minimum and maximum number required to unlock the highest level enchantments (level 30)

Key Details:

• Bookshelves must be placed with a one-block gap of air between them and the enchanting table.
• The enchanting table should be centered in a 5x5 area with bookshelves arranged around it.
• Bookshelves can be stacked up to two blocks high.
• More than 15 bookshelves will not increase the enchantment level beyond 30.
• Each bookshelf requires 3 books and 6 wooden planks to craft.
• To craft 15 bookshelves, you will need 45 books, which in turn require 45 leather and 135 paper (made from sugar cane).

Summary:

• Number of bookshelves for level 30 enchantment: 15
• Bookshelves crafting materials: 3 books + 6 wooden planks each
• Books crafting materials: 1 leather + 3 paper each
• Bookshelves placement: Surround enchanting table with a 1-block air gap, in a 5x5 square area

This setup ensures access to the highest enchantment level available in the game