This lecture covers the analytical study of space, focusing on points, lines, and planes. It explains the concept of a reference frame in 3D space, the choice of a base, orthonormal bases, and the coordinates of points in space. The lecture also delves into the study of planes, fixing a reference frame, and the equations that describe them. It concludes with the study of lines, finding points on a line, and determining the direction of a line in space.