In this lesson, the instructor reveals the fundamental principles of forming an aiming line and a proper sight picture — essential elements for achieving consistent shooting accuracy. You will learn why a correctly aligned sighting system is more critical than a perfect stance or grip, and how even minor misalignments between sights result in large deviations on the target. The instructor explains how to work with various types of sights — from mechanical diopter and open sights to red-dot, optical, and thermal sights. You will learn how to align the three key points into a single straight line: your eye, the sighting mark, and the aiming point on the target. Special attention is given to parallax effects and how improper placement of the reticle inside a red-dot sight can significantly impact accuracy.