4.

If you learned Taekwondo correctly the technique, which is your ilgiyae, must follow the principles of Samjae and Kang-Yu.

It is reasonable that every good technique follows the principles of Samjae and Kang-Yu. This is not difficult to understand.

You should be able to preoccupy more advantageous position than your opponent and subjugate him with less strength if you use good technique. This is what the principles of Samjae and Kang-Yu just tells you.