Nexus Mod Manager is a free open-source application that you can install for free at the nexusmods website, provided you register for a free account.
Since not all (or even most) of these PC mods can be found on Bethesda's mod website, I also go through how to use the Nexus Mod Manager to install and configure the mods found on this website. Here are some additional mods available over at the Nexus modding community in order to maximize your personalization of your Skyrim Special Edition experience. But you're playing on PC and want to customize your Skyrim experience even further. So you've read our article The best mods for Skyrim Special Edition on Xbox One, PS4 and PC and maybe you've found a few things you like.