I began writing down the books I read, with author’s names when I was in college in the summer of 1968 and have kept it up. Some years I only read 20 or 30 books, primarily when I was over seas in the Army.
Back in the 90s, on a computer BBS (dial-up), someone suggested opening a text file, called it BOOKSnn (with nn being the year) and just add to it after you read a book.
I did that for a while, then I started keeping a tiny notebook, because I found I didn’t remember a lot about some of the books I was reading. Didn’t help that many weren’t great books. I was getting them from thrift stores and closeouts and such for 49 cents. Of course they weren’t bestsellers or classics.