Can I download someone's entire Mods folder and get all their custom content in one go?

Hello.
It is better to go to the individual sites to download the cc or mods. When at the sites, you can then read more information about the cc/mods and instructions that the cc Creator has written about how to install and use the cc/mods. The sites will give info on where /how to find the cc in the game. With mods, you will know what sites to go to for checking if there are updates of the mods after a game patch. By going to the cc sites and downloading the cc/mods yourself, you will know what you are installing in your game, and what files refer to what cc.