It is possible to craft a variety of in-game items like consumables, armor, and weapons using workbenches located throughout Appalachia. Like in Fallout: New Vegas, it is possible to craft ammunition in Fallout 76. Modding is carried out by applying pre-defined components to armor and weapons, like adding lead to armor parts for enhanced radiation resistance or equipping several types of barrels on firearms. When scrapping, you will "discover" new mods to put on the gun you have been scrapping.
The basis for all crafting and modding is the gathering of raw components listed below. Scrapping is commonly required to harvest these materials and can only be done in "Workshop Mode". Some items will outline in yellow, while other items will outline in green when in Workshop mode. This seems to only indicate whether the item is able to be moved and has no other purpose. Green items can be moved, yet yellow items are fixed in place.
Cooking station: For preparing scavenged edible items, boiling water, or diluting aid. Unlike in Fallout 4 the recipes for every item in the game (crafted at the cooking station) do not appear until you either find the recipes for them, or have one or more of the components needed to craft them.
Raw materials can be turned into bulk versions at a Tinker's workbench. This costs a set number of the involved raw material to be bulked, plus two plastic to wrap it. There are only two materials that will reduce the weight of a junk item in your inventory or stash when compared to their non bulked counterpart. These two are aluminum, which will reduce the overall weight by 0.5, and Lead, which will reduce the overall weight by 1. Plastic technically experiences a weight reduction, but 2 of the 12 are consumed in the crafting recipe, leaving you with 10 plastic, which weigh the same unbulked.
It may appear when creating bulk items that you are saving space in your stash with each item, but that is because of the two plastic it costs to create each bulk item, giving you a gain of 0.1 weight with each bulk item, because they are consuming plastic.
Another advantage to creating bulk versions is the in-game robot merchants will buy bulk items but not individual raw materials. The disadvantage is the need for plastic which can be used up quickly if a large number of items are being bulked.