Sweeping gestures from the shoulder allow you to make generous marks, well suited to large scale work. You don't get anything simpler than this - I'm sure it is the way the cave men drew.
Spaces between the forms, or the negative shapes, play just as great a role as the positives and they enable you to check the accuracy of your drawing. The positives make the negatives and negatives make the positives.
In the real world there are many tones, from white at one extreme, through a large number of medium tones to black at the other extreme. To achieve a three-dimensional effect on paper you need just three - white, black and medium gray.