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First of all, when I say Mod, I'm saying about Modifications.
Firstly, you'll need to know that those mods are in .wad files, somethimes .pk3 but what we will learn is the vanilla way.
Download a .wad in the internet, a example is this one: Example map
Now that you have the .wad you will put in your doom folder, normally, to execute the map you do:
Doom will open and then you'll play the mod