Yin and yang is a basic tenet of Feng Shui but is often difficult to observe. Now that we are relegated to our homes, it is helpful to see what kind of home you live in. Mountains are often considered yin as they do not move, and are balanced by water, which is always moving and yang. If you have freeway bypasses near your home, that is a representation of fast moving water and is often too much yang. If you have a winding street with slow traffic, that is an ideal representation of water-meandering and more yin.
The idea is to create a balance of nearly equal yin and yang.