Mental Strength: Four books against fear and for more resilience. “Compass for the Soul” by Bas Kast is considered a classic for mental health.
Klara Hanstein “Dear Fear, just shut up” is a self-help book that contains tried-and-tested exercises. Marianne Wellershoff (ed.) “I overcome my fear” shows how to deal better with your fears, strengthen your resilience and act more courageously in certain situations.