[ARCHIVED] How to use Mods/CC on PC

Hello! I've played Sims 4 before on a friend's computer and I started playing on my own computer. I watched tutorials and read articles about how to download CC and mods and whatnot. However, when I open the game, and I create a sim, none of the CC is there! There isn't even an option in the filters for content. I have no subfolders in the "Mods" folder, and all the types for the content are the .package files. What can I do??