Dan's series on prototyping is also amazing: <a href="https://www.youtube.com/watch?v=xMP_AfiNlX4&list=PLSGA1wWSdWaTXNhz_YkoPADUUmF1L5x2F" rel="nofollow">https://www.youtube.com/watch?v=xMP_AfiNlX4&list=PLSGA1wWSdW...</a>