One thing that really got me while working on computers and networking right as LAN networks became a thing in the late 90s and early 2K years was… I’m connected to this switch, and so are they. Why do I need to burn a CD/use an external hard drive (later a flash drive), to move data?
Took me a while to figure out SMB/cifs, and when I did … Game changer. Since then I’ve also learned all I can about storage, networking and file sharing. Most of my USB drives sit on my desk and don’t get touched. I couldn’t tell you what’s on most of them. I’ve picked up a few thinking that I’ll use it, but the most useful thing I’ve done with flash drives is to move data between computers when upgrading other people’s computers. For me, I just make sure everything is backed up/synced to my local NAS, wipe the system and reinstall without a care in the world.