Two books that changed my relationship with money for the better:
The Millionaire Next Door by Thomas J. Stanley and William D. Danko.
An older book, but the mental model of the people profiled is useful to understand and consider adopting elements of.
Your Money or Your Life by Vicki Robin & Joe Dominguez
I wouldn’t, and haven’t, gone full frugal as outlined in this book, but it’s useful to understand how far that axis of existence goes and then adopt the elements of it that work for you (we have adopted a lot of useful stuff from this book).
The links above are to Amazon (sorry) where you can get paper or Kindle versions, and here are Audible versions of both of these in case audio books work better for you:
The Millionaire Next Door
NOTE: Of course, both of these books would say “there is no reason to BUY these books! Get them from your library, or via inter-library loan if your library doesn’t have them. If truly not available that way, buy them used.” 🙂