I keep a reading journal and change it up each year to fit what I'm interested in tracking at the time. Some things remain the same for it: book title, author, date I finished the book, what medium (audiobook, ebook, physical copy), and whether it wad a book I own or borrowed from the library.

The things that changed that I started tracking this year was genre, fiction/nonfiction, and the country that the author is from because I'm trying to read more books published outside of the US this year. I also rate my reads on a 1-5 star scale.

All of this is done in a physical journal and so far I've got 3 years worth of reading and reviews in it. I like having it in a journal instead of using something like goodreads or the story graph (I use that to track what I want to read, but not what I have read) because I use my tracking systems more when it's physical rather than digital.

I have started a Google sheet that lists all of the books I started reading and the date because I start so many more books than I finish and am interested in seeing the comparisons between started and finished books by the end of the year.

Tldr: I use a physical journal to track books I've read and my reviews of them, google docs for books I've started, and the story graph for my TBR