Taoism focus on the way the life should be lived. It says that one should become one with the Tao (The universal force), by observing and trying to be like nature.
Lao Tzu believed that the strive for glory was what caused suffering. He thought we should just let life play out the way it naturally would. He wanted people to focus on our own path, which he thought was completely different for everyone.
Lao Tzu also preached that we should accept both the good and the bad in life. Also known as the Yin and Yang. This way we could be balanced in life.
Lao Tzu was a brilliant man, who preached on what he thought was the source of happiness.