If you have an SSD drive, like I do, it's likely to be small. So you're going to be wanting to get your "user" files off of it. That's relatively easy to do, you just have to right-click on each folder inside your username and then find the "location" tab and put the directory on another drive. Windows will ask you if you want to create the new directory and move all the files to it. You say yes and violins! It's done.
But moving the "app data" directory is basically a no-go. Which is a pain in the tuchus when programs are going crazy putting junk in app data.