I am surprised I haven’t seen Kavita show up here yet! It’s a very nice self hosted ebook/manga/comic reading server that you can access from a web browser on any device. It’s really matured over the years.
I have a few thousand novels in there and really like being able to hop between devices while keeping my spot in a book.
To be fair, Windows doesn’t ask to install all the bloat, it just does it lol
I can’t help with music specifically, but for audiobooks, I have found that nothing can beat AudiobookShelf. It is a self hosted service much like plex and jellyfin, but it is made specifically for audio books.
It was such a huge improvement to the way I listened to my audiobook files that I wish I had found it sooner.
That’s just a hint / it cycling through things you can do with windows. It shows those while its updating