A more thorough explanation:

A marksman is someone who is highly skilled at shooting.

For example, a soldier who is trained to hit targets accurately from a long distance is a marksman. A professional hunter who can take down prey with a single shot is also a marksman.

Being a marksman requires a lot of practice and training to develop the necessary skills and techniques. It involves not only aiming and shooting accurately, but also understanding ballistics, windage, and other factors that can affect the trajectory of a bullet.