The Millionaire Next Door is a good read on lifestyle choices and changing perspective on what it means to be wealthy.

Random Walk on Wall Street is a great book on investing (spoiler alert: index funds).

I actually really found value in Tony Robins’ book on finance, even though it’s couched in a bit of an infomercial style. (And he advertises for some of his own companies, albeit transparently.)

You Need a Budget (the app / company) also made me think differently about budgeting. But, I still use the old version of their app and have no idea how well the new web-based version works in comparison.