Before we get into this, I want to make one thing very clear: the lesson content on this page is a LOT to take in. The video may help you understand better, but it's not all going to sink in all at once. Watch the video, then read through the written material, then even if you're unsure of things, move onto the exercises. As you work at it and employ the concepts described, it will gradually start to make more sense over time.
Finally, having sloughed through lines and ellipses, we've reached the namesake of this website - boxes. I chose that as our name not because it is all I wish to teach you, but because it is representative of so much more.
A box consists of three sets of parallel lines. If you're familiar with three dimensional geometry, each set defines an axis - either x, y or z - and in doing so, it establishes the foundation of what we understand to be 3D space.
Any object can be simplified into the box that encompasses it. Any form can be represented and constructed within - you guessed it - a box. And any box can be subdivided, carved, and built upon to create any complex object.
But if we want to learn how to draw a box, first we need to learn something about perspective.