Crafting is the ability to create items using more basic ones. In Junk Jack X, crafting is used to craft better items in a crafting grid. If you don't know how to craft things in a crafting grid, there is an option in the Options Menu to enable Simple Craft.
 Simple Craft
Simple craft is an option to use the Craft Book as a "Crafting Grid". This option is automatically activated at the start of the game. It's recommended for begineers to use this option.