1.

This I have learned.

Taekwondo is Ilgiyae; one technique. You should not try to get several techniques. This is important particularly when you are a beginner. You must obtain one technique that assures you. You are supposed to practice it several hundred thousand times with growth of your understanding. And you should be able to use it freely. Anytime, anywhere and in any situation the technique should be performed in your instrinct. And make it grow up. It is all of Taekwondo.