brenebrown.com
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Brené Brown's site provides research-based insights on vulnerability, courage, resilience, and leadership. It features articles, books, talks, podcasts, and online courses (such as Dare to Lead) to help you build grit and courageous, wholehearted living.
More resources on Resilience & Grit
hbr.org
Harvard Business Review (hbr.org) offers research-based articles, case studies, and practical guidance on leadership, strategy, and organizational performance for managers and executives.
ppc.sas.upenn.edu
Official site of UPenn's Positive Psychology Center, showcasing research on well-being, happiness, and character strengths, and offering resources, training programs, events, publications, and practical tools for educators, researchers, and practitioners.
Angela Duckworth's Grit Lab
Homepage of the psychologist behind the grit construct, collecting her published papers, the Grit Scale, talks, and Character Lab materials. Useful for going from popular summaries back to the primary research and measurement instruments.
Daily Stoic
Ryan Holiday's site publishing daily essays, interviews, and reading lists on Stoic philosophy, drawing on Marcus Aurelius, Seneca, and Epictetus. Regular reading builds a working grasp of core Stoic practices such as the dichotomy of control and negative visualization.
Grit: The Power of Passion and Perseverance (Angela Duckworth TED)
Angela Duckworth's TED talk arguing that sustained effort toward long-term goals predicts achievement better than talent or IQ, based on her studies of cadets, students, and salespeople. Introduces grit as a measurable trait and its link to growth mindset.
Grit
Duckworth's account of why sustained passion and perseverance predict achievement better than talent, built from studies of cadets, spelling-bee finalists, and salespeople. You come away with the evidence base and the Grit Scale's underlying reasoning.