Qigong is a method of practicing internal qi in human body. It has no martial arts moves, that is, attack and defend, and its movements and postures are completely coordinated with internal qi. Sometimes the internal strength in martial arts is also classified as qigong.
Tai Ji Chuan has Taiji internal skill, which is the foundation of Wushu and runs through Tai Ji Chuan. It is not enough to practice martial arts routines and moves, including some techniques in actual combat. First of all, you should lay a good foundation and seriously practice your internal skills as a method of lifelong practice.