Although there are many moves in Songahm Taekwondo, and martial arts in general, they can usually be categorized into these types: hand movements (strikes and blocks), kicks and stances.
There are two basic types of hand motions. The first is striking, an offensive technique. The second is blocking, a defensive technique. To develop the quality of their techniques, one must focus on proper starting position, execution, rotation, direction, and ending position. To improve the power of hand movements, one can add body movements such as twisting the hips.
The term kicks is used to describe the element of foot motion. To develop the quality of technique in kicking, it's important to focus on the the stages of foot movements and body posture. The stages of kicking include the following: proper chamber, execution, rotation, direction and re-chamber. To achieve excellent kicking technique, movements of the foot must be combined with proper body posture.
Seo-Gi (stances) are structured body positions. In Songahm Taekwondo, their primary purpose is a training tool to allow students to execute techniques in conjunction with various body movements. By learning stances and executing techniques from these stances, they learn to add power to their techniques while remaining stable, and also to become more relaxed in executing their techniques over time. The secondary purpose of stances is conditioning, both in muscle development and in stretching.
It should also be noted that very few stances are actually developed for combat or sparring. Given the structured nature of stances, and the chaotic nature of combat, attempting to fight from a stance would actually put a Songahm Taekwondo practitioner at a disadvantage.