How do I move the Music folder on my Macbook to an external SSD drive?
Thanks to an accumulation of mysterious "system data" that apparently can't be eliminated or reduced, I have run out of storage space on my MacBook. I can't update the operating system or software. I can't even make a Time Machine backup to my external drive, because that requires some sort of temporary copy on my hard drive while the backup is being made. Apps are quitting on me because I have so little extra storage space. I can't move my photos, music, and other big files to iCloud because I live in a remote rural area with crappy satellite internet service that is slow and data-capped, so it would take forever to do that.
I would like to move my Music (and if that's not sufficient, possibly also my Photos) to my external drive to free up some storage space, but I can't find good step-by-step instructions for how to do that. I know how to drag a folder to the external drive, but I don't know how/where to find the right folder or what to do afterward to delete it from my Mac hard drive. Please don't tell me to "simply copy the Music folder from your Mac to your external drive." Please don't tell me I just need to go to "~something." Please don't tell me to use a third-party app. Could someone explain it to me like I'm a dummy?
MacBook Pro 13″, macOS 15.2