This document provides a summary of Cal Newport's book "Deep Work". It discusses that deep work refers to focusing intensely without distraction on cognitively demanding tasks. Deep work is valuable for quickly learning hard skills and producing work at an elite level. However, deep work is rare due to people using busyness as a proxy for productivity and the cult of the internet. The document also outlines Newport's rules for doing deep work, which include working deeply through focus, embracing boredom, quitting social media, and draining shallow work.