[swed420]

Personally I like to highlight certain passages (non-fiction) for future reference, and this only works on ebooks.

[officeplant]

You can also bookmark audiobooks depending on the platform/playback application.

[loughnane]

Works on print too, no?

[swed420]

In a limited fashion, yes. But ebooks mean you can search highlights, categorize them, see summaries of them, etc if using calibre, zotero, or similar.

[dredmorbius]

Zettelkasten.

[swed420]

I love Zettlr for this!