Ryan Holiday writes excellent books. Ego is the Enemy and The Obstacle Is the Way are my two favorite. These books are influenced by Stoicism, and ancient philosophy of mental toughness and being present.
What I love most about it is the idea that we can control our behavior and the framework it provides to be intentional.
He wrote aseries of emailsteaching about the basics of the philosophy, and it’s definitely worth signing up for and reading.
My two favorite emails are about daily journaling and remembering that we can die at any moment.
Go check it out.