📚 How do you manage your books (EPUBs)? 🤔

**Can someone please explain/recommend how to manage your books (EPUBs)? 🥺**

I have an X3 (with CrossInk) and a Kobo (Libra Colour with KOReader). I also have Calibre on my PC.

I want to have the EPUB files in Calibre and also on both readers (X3, Kobo). How would you optimize the EPUB files, and do you have different versions of each device?

I read most people use [epubkit.ink](https://epubkit.ink/) to optimize their EPUBs for their X3/X4. This will also make the cover black/white/grayscale (?). Do I keep a different optimized version just for the X3? Or do I optimize and not use the "Images: 4-level grayscale with dithering, resized to screen, baseline JPEG" feature?

What's the recommended way to manage books (in Calibre)? Or do you manage your books differently? I don't really have a lot of books; I just recently started reading, so I can also switch to other options if you think they're better and/or easier.

I'm really lost here and appreciate any help. Thank you very much.