Mindset
Carol Dweck's book has simple thought: growth vs fixed mindset is the core of learning process, how we face the challenges. Because of simplicity, this thought really feels true. The corollaries of the mindset are huge. Literally - the general path in life we choose when using one mindset or the other. As a father, chapter about praising effort and not the talent in the children is especially helpful (done something very fast and without effort? Then it was too easy for you, let's do something challenging!)