It's experience. There's no such thing as undocumented experience. Training yourself to see your experiences as valid in an of themselves is a process, one I've struggled with myself; but, it's really important as it's expected that from employers that you're not filtering out expertise you have because it "wasn't professional enough" or whatever. Running a Plex server for friends to stream from is valid experience and worth considering if you're building out time ranges on your resume (eg. N years of experience with $technology)