Those who don't want to go through the process of installing each individual mod will probably want to acquire the Vortex Mod Manager from Nexus' website. From Nexus Mods though players will be able to access and download anything that they wish.
Everything on this site should be 100% safe, but players should still exercise caution when downloading things just in case, and probably shouldn't download anything that isn't highly rated and commented on. This community is full of helpful modders who provide interesting and fun mods for thousands of games. The best and easiest way to mod games is to set up a free account with Nexus Mods. Installing mods is actually a pretty simple process even for the uninitiated.