If you want to learn any martial arts such as boxing, karate, wing chun, it is better to learn from martial arts instructors. You can inspire or expand your knowledge watching videos, but learning from an expert is very important who can not only show you how to do it but also correct your mistakes.

If you think you are doing it right, your instructor/master can tell you exactly what's wrong with the movement. I am passionate about martial arts. Thank you @ikrahch for sharing this.