Shadows are very important for the drawings. If you want to draw any object, it will look much better if you add its shadow. In the tutorial by Easy Things to Draw, you have the simple instructions for this subject. For starters, draw an object, a simple one like the cube. Then, you should draw a light post that will guide you with the light and the shadow. Next, you should connect the light source and draw lines from it to the corners of the object. You should repeat this, with all corners and the ground point. The space where you will have new dots is the place for shading.
Shadows in your Drawings
See the tutorial below.