There are several schools of Zen and Chan Buddhism. Each school has its own methods of practicing zazen, although the basic concept is the same in terms of sitting posture.
I have looked for a simple overview of how to practice zazen (sitting meditation), and some of the concepts behind it, as well as a simplified overview of the way the Zen schools view living, life, the universe…… their cosmology.
This short “manual” does a great job of that.
Click to access Introduction%20to%20Buddhism%20and%20Zen.pdf
Gassho
Reality is Dharma 