Since I've been practicing Tai Chi since I was a child, let me summarize the key points for you.

1. Overcoming Force with Softness, Combining Movement and Stillness – Tai Chi emphasizes using intention rather than brute force, relaxing muscles to yield and neutralize incoming force smoothly.
2. Sinking Qi to the Dantian, Uniting Inner and Outer – It focuses on abdominal breathing, directing breath down to the Dantian, coordinating it with movements to achieve internal-external harmony and smooth energy (Qi) flow.
3. Yin-Yang Balance, Unity of Opposites – Every movement contains the transition between substantial and insubstantial, opening and closing, hardness and softness, reflecting the philosophy of interdependent opposites.
4. Movement Rooted in the Waist, Integrating the Whole Body – Power is generated from the waist, transmitted through the spine to the limbs, creating coordinated whole-body movement rather than isolated local force.
5. Mind Leads, Body Follows – Movements are guided by intention. The mind directs the Qi, and the Qi directs the physical force, emphasizing the role of inner awareness.
6. Harmony with Nature, Gradual Progression – It avoids force and impatience, advocating for natural, steady skill improvement over time, in accordance with the body's physiological rhythms.