Taking photos of people when they have no idea that you’re doing it is called candid photography. One of the beauties of photography is being able to catch someone in the act. It adds life to your pictures.
Train your eye to capture the moment.
Keep your camera on the appropriate settings. This form of photography has a heavy reliance on light and furthermore, you may not always get to select the angle. Your angle could be wherever you happen to be at the moment.
