Hello, this is Emily.
You can move some files to the SD card to make room, but make sure these are your personal files, not system files. System files are not meant to be moved out of the system drive (C:)
Personal files typically are the ones located in Documents, Pictures, Videos, Desktop and downloads folders. After you copy them, you can safely delete the ones on C drive. Or you can use Cut instead of Copy, then paste them into SD card I don't personally like to use Cut, in case something goes wrong during this processs, you might end up losing those files.