Just go with it thinking all of this is an exercise, Drawabox doesn't demand you to do an exercise perfectly.

My suggestion would be going through the material until you get it (the concept at the very least).

Although if you are really having trouble with it i can think of an exercise you could do.

• You could do a simplified version of the exercise just to understand the concept:

Instead of doing full "complex" 3D forms like cubes, pyramids and such, maybe start by doing the intersections of things like planes + ellipse, plane + plane, just like this

And you can't draw them in different colors (at least for the exercise) specially because the lesson also teaches you to use line weight to clarify your overlaps and intersections.

Ultimately i would recommend to not go crazy over it and most importantly do not grind, it will only take up your time.

I'm not sure if another colour would be allowed. Maybe someone else could chime in on that.

Keep in mind that Comfy stated that intersections are not the actual focus of this exercise; they should be an afterthought to placing the overlapping forms in the same space. Intersections can be very confusing and difficult to do, but give it your best shot (if you decide to do it all) and move on.

If you did use a simplified version of intersecting as suggested by Ledvi21 (which might not be recommended in the course as it's not the assigned homework; though it is a valid exercise), remember always to draw through your forms.

Whatever you do, I second Ledvi21: don't grind. Do what the course requires and move on.