If you’re interested in something, do you since up for more than one instance in that topic? For example, if I want to read about Apple related stuff, would I want to sign up for a few different Apple subreddits or just one?

I’ve also heard about earbuds specifically designed to tune out noise. Wonder how those work?

No, I just “sync” my kobo to my home network with the Calibre Web instance running and it syncs the library automatically.

In order to do that you have to edit the Kobo device configs and replace the Kobo store address with the local address of your Calibre web server.

I use Calibre Web for this.

I have a Kobo Libra 2 and can sync it wirelessly to my Calibre library. Love it!