How to craft weapons in Destiny 2: The Witch Queen

Destiny 2: The Witch Queen has added weapon crafting, a method for steadily unlocking the potential of a weapon, instead of just stashing dozens of random rolls in your vault. But how does it work, and what materials do you need to craft a weapon? Luckily, I've made this handy Destiny 2 weapon crafting guide to help you get started...
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