SkyFactory is a modpack, you'll need a modpack launcher to install it. This can be Twitch for Curseforge, Technic for Technic for example.
Mods go in the mods folder but modpacks are a collection of mods and if its just a zip file with few files in it then I'd assume you got it from Curseforge so best to use Twitch for it as Twitch's launcher not only exports them that way but when importing the modpack it reads from those files in the package and downloads the mods/setups up everything for you and once it's done you hit play.
if you'd like any other help just ask or look for launcher tutorials on Youtube. But for the most part I'd say download/install the launcher, follow the steps and you should be fine (or look to Twitch's website if you need to know where to install Minecraft to through their launcher, add mods and so on).