How to get registry names

In Minecraft, everything has a registry name that declares what mod an item is from and what the item is (e.g. the registry name for Stone is minecraft:stone)

To get this names, you can do any of the following:

• Enable advanced info with F3 + H and hover over anything in your inventory to see its registry name
• Use the /ct hand command from CraftTweaker to auto-copy the name of whatever you're holding to your clipboard (you will have to remove the CT formatting though)
• Use the /kjs hand command from KubeJS to do the same (but it won't auto-copy)

You can also copy/paste names from other files if needed.