It couldn't be easier to install Mods and CC to the Sims 4.
If you're new to Mods and CC the best websites to check are The Sims Resource and Mod The Sims and even Tumblr.The list of mods and CC is never ending so this list won't include everything we recommend - look out for another post for that! Installation Guide
The Sims 4 mods and CC creators are a pure gift to the community, even though EA have provided an abundance of packs with new content they can't do everything. The Sims as a franchise has existed for over 20 years with the first Sims game being released in February 2000, meaning the modders have had a lot of time to perfect their creations.