Qi in the West is usually translated as "life force", "life energy", or simply "energy". It is an amazing and beautiful thing. For a balanced life we must understand it.
This understanding of life is unique to each culture of the universe. The Chinese call it qi (pronounced chi, or chee), in Japanese and Korean they call it ki. In yoga, they call it prana and in Southeast Asia they call it mana. In other traditional cultures have their own name and concepts, which are unique to their environment. But all are looking at the same concept from different points of view.
Qi is life force. It keeps life alive and flowing. It is the base for Qi Gong, Tai Chi, Kung Fu and meditation.
Channels and Acupoints are the pathways and connecting points for qi to flow. Keeping the channels and acupoints open and free of stagnation is key to health.
The Three Treasures include the Jing Qi Shen is the transition of essence from the Lower Dan Tian and kidneys to spirit in the Upper Dan Tian and brain.
Dan Tian is a source of qi for health and strength. They are a reservoir and transistor of qi in the body.
Breathing is central to life. It is something we must learn to perfect to maintain physical and mental health and strength.