"The Confidence Gap" by Russ Harris is a book that can help individuals to overcome self-doubt and build greater confidence in themselves and their abilities. The book is based on the principles of Acceptance and Commitment Therapy (ACT), a mindfulness-based approach to therapy that emphasizes the importance of accepting difficult thoughts and feelings, while taking action towards one's goals and values.

One of the key takeaways from the book is the idea that confidence is not something that you either have or don't have, but something that you can build over time. The book provides practical advice and exercises for individuals to use in their own lives, including mindfulness techniques, cognitive restructuring, and behavioral activation. By practicing these techniques regularly, individuals can begin to overcome self-doubt and build greater confidence in themselves and their abilities.

Another important concept from the book is the idea that confidence is not just about feeling good about yourself, but about taking action towards your goals and values. The book encourages individuals to take small steps towards their goals, even if they feel uncertain or afraid, and to focus on the process of growth and learning, rather than just the outcome.

Overall, "The Confidence Gap" is a valuable resource for anyone looking to overcome self-doubt and build greater confidence in themselves and their abilities. It is a practical and accessible book that provides individuals with the tools and strategies they need to take action towards their goals, while also accepting the difficult thoughts and feelings that may arise along the way.