Feng shui is kind of like what the golden ratio is to art. Just like with the golden ratio and art, things are arranged in ways that are most aesthetically pleasing to the eye. So, for example, maybe arranging the seats in a room in a certain way that is pleasing and gives you a sense of harmony.
The most important concept to remember is that you are responsible for your own safety and the safety of others. Most safety practices are common sense. Unfortunately, they can be forgotten or overlooked unless you make safe practices a habit or an instinct.