The Goal and It's not luck by Goldratt.

Showed a better way to manage anything in particular ourselves.

Man's Search For Meaning by Viktor Frankl even in the darkest of times we kind find Meaning.

A Guide to the good life. The stoics found a way to handle our human experience 2500 years ago.

The mythical man month by Brooks. Everything we struggle with in software development we have been fighting since the 70s.