"The First 20 Hours: How to Learn Anything...Fast" by Josh Kaufman. The book argues that anyone can learn a new skill quickly by applying a structured approach based on 10 key principles: choosing a lovable project, focusing energy on one skill at a time, defining a target performance level, deconstructing the skill into subskills, obtaining critical tools, eliminating barriers to practice, making dedicated time for practice, creating fast feedback loops, practicing by the clock in short bursts, and emphasizing quantity and speed. Kaufman then uses the book to demonstrate his method by learning new skills such as programming, touch typing, playing Go, playing the ukulele, and windsurfing, all in a relatively short amount of time.