I like to store useful medical and survival information either in my ArchiveBox and/or kiwix containers. I’ve also been meaning to put together a local wiki.js with more custom info. TubeArchivist is really good too for storing instructional videos for offline use, or videos I find incredibly useful that have a strong likelihood of being taken down by YouTube so I save them first.

for the metadata, LLMs may not prove so great. Use MusicBrainz Picard or Beets

I use local AI for coding (more recently) and ML Photo storage facial recognition and security camera object detection (been using the later 2 for years now actually, don’t want that kind of info out on someone else’s cloud training on my images)