A Page of Training is an item in Diablo III. There are two types: pages of blacksmithing and pages of jewelcrafting. You will need 10 pages to upgrade jewelcrafting and 5 pages to upgrade blacksmithing beyond level 4. The pages can be found as loot in the whimsyshire level on normal diffuculty or on Nightmare difficulty and up. They can also be bought on the Auction House. Beyond this page level you need a tome.