To start learning drawing one should start with the basic drawing like cubes, spheres, cones, pyramids etc. These are certainly the basic shapes an artist draws. Basic shapes are necessary at the start to become sensitive to shape, shades and light, cast shadow, the darkest dark, the lightest light.
The next step of learning drawing is to draw life objects. The artist's line of vision to the subject is either perpendicular or oblique, life drawing is suitable to learning them all. The third best thing to study is the perspective drawing.
These are the starting points to learn drawings. Share if you have more ideas for the beginners to start learning drawing.