How to quickly and effectively learn anything?

American business coach Josh Kaufman mastered six new skills in a year: he studied programming and wrote two programs in Ruby, relearned touch typing from one layout to another, started practicing yoga, learned to play "Chinese chess" Go and the ukulele, and mastered windsurfing. He wrote a book about this, “The First 20 Hours. How to quickly learn ... anything. This book is worth reading.