A very strong input into my book choices is reading the ‘classics’ in various domains. I will make frequent use of “Top 100 X books in Y” and “best X book of all time” queries.
I very much subscribe to the idea that selected books form a cultural and intellectual endowment of society to its members. Reading these selected books allows me to competently participate in society, as so much of our communication, institutional structure, and culture is downstream of these works. Examples of such works would be Shakespeare, Dickens, Silent Spring, The Intelligent Investor, Manufacturing Consent, Plato’s Republic.