For tactical advice, I find talks/podcasts and mastermind groups more useful than books. My favorite podcast (by far) is Rob Walling's Startups for the Rest of Us, which is oriented towards building a capital-efficient bootstrapped business. The archive is full of extremely valuable tactical advice.
The books I've found most helpful on my entrepreneurship journey are about mental health, emotional intelligence, and relationships of all kinds. Sharing a few that have had a profound impact, since they helped me metabolize and understand what drove me to become a founder in the first place.
1. The Self-Compassion Skills Workbook by Tim Desmond
2. Path of Compassion by Thich Nhat Hanh
3. The Book You Wish Your Parents Had Read, Philippa Perry
4. Burnout, Emily Nagoski
5. Adult Children of Emotionally Immature Parents, Lindsay C. Gibson
6. Self-Compassion, Dr. Kristin Neff
7. How to Keep House While Drowning, KC Davis
8. Deploy Empathy, Michele Hansen
9. The Body Keeps the Score, Bessel A. Van der Kolk
10. Atlas of the Heart, Brene Brown
11. What Happened to You? Conversations on Trauma, Resilience, and Healing by Bruce D. Perry and Oprah Winfrey