I started tracking my reading this year, I ended up making myself a Google spreadsheet with a form that feeds into it because I struggled to find a tracker app that I liked that tracked the things I wanted to track

I intend to also start a physical diary for notes but I like seeing the raw data, for example I've noticed my wpm drops for books I don't enjoy as much as others

I do both but I'm trying to buy fewer physical books due to space, my ereader has been very helpful for this because I can borrow ebooks from the library - lots of ereaders have note taking options too, although I don't really make notes personally

Maybe fo a "voucher" for a book buddy experience, she picks the book you'll buy the books and read it at the same time