What are the two main kinds of drawing?

Answer 1

Breaking drawing down into two categories is like slicing a loaf of bread. You can slice down so's to give you the kind of slices used to make normal Sandwiches. You could slice diagonally. You could also slice horizontally, giving you long, longs slices.

Line drawings vs. Tone Drawings.

Line drawings uses crisp marks to outline forms and features. Ink is usually used in this type of drawing.

Tone (or tonal) drawings use softer, thicker sweeps of the dry medium (pencil, charcoal) to create shades of grey to describe forms and features.

Freehand vs. Mechanical Drawings.

Freehand drawings are made using only the artist's intuitive sense of proportion. (eyeballing it) These could be made of a portrait of a person or of a house...

Mechanical drawings are made using tools like a t-square, ruler, circle templates, etc... to make precise depiction of (usually) man made objects, buildings...