Here are a few classic nondual texts from different traditions. I am only posting texts that I have read and found helpful. Vipassana and Western Buddhism: Waking Up, Sam Harris (Harris practices Dzogchen and Vipassana) Seeing That Frees, Rob Burbea (quite dense but very profound) The Science of Enlightenment (Shinzen Young, my main meditation teacher until he stopped teaching) The Mind Illuminated (Culadasa) Mahamudra: Progressive Stages of Meditation on Emptiness (Khenpo Tsultrim Gyamtso Rinpoche) The Diamond Approach: The Point of Existence (A.H. Almaas) Facets of Unity: The Enneagram of Holy Ideas (A.H. Almaas) Kashmir Shaivism: The Recognition Sutras (Christopher Wallace) Christianity : The Wisdom Jesus (Cynthia Bourgeault)

I also really love Michael Taft's Deconstructing Yourself Podcast: https://deconstructingyourself.com/