One of the popular websites to find all different kinds of CC is Lana CC Finds.
Wonderfully, it is separated into categories and subcategories of CC and Mods, Maxis Match to Alpha!
The blog includes hundreds of different creators. She has stopped posting; however, a still great place to scroll through and download everything you like!
YouTube tutorial on how to download CC: CLICK HERE
Learn More about what CC is: CLICK HERE
P.S If you play other Sims franchise games, such as Sims 2 and 3, there are tags for that as well!