How do I know what chess books to buy? I have a lot of my own chess games in pgn format, Im wondering if there is a tool that examines my games and suggests what books I should buy to improve?
Full disclosure: I am answering my own question. I recently finished the alpha version of an app that maps chess games to diagrammed positions in chess books (https://www.thechesscite.com/).

The primary goals is to help you to make better choices about what books to buy and to help chess authors cite their colleagues. My other goal is to streamline how you study chess.

See more on the site. I’m still very early in development but have a lot of features planned. Hopefully I’ll see a little interest from the chess community and grow the tool over time. Would be happy to take feedback; however, be aware there are some minor quality of life issues I already know about, and I am a one person team. I'm eager to share this tool even if it's just getting started.