There are 3 materials in taekwondo practice and this is also an important thing that taekwondo beginner athletes need to know:

Kyukpa. This technique is a technique for breaking hard objects and in practicing it we need inanimate objects such as tiles bricks or at least wooden boards where you can kick beat or hit.

Poomsae. This technique is a series of basic movements of defense and attack by fighting opponents in imaginary form.

Kyoruki. This is a battle practice where basic movement techniques are applied. In this exercise it takes 2 people to do it.