How do you draw a contour map? Please don't ignore if you know the answer!!?

A contour map is a map of the topography of an area. Let's say you have a perfectly circular hill. There would be a line around that hill at, say, the 700 feet mark, to denote the point at which the ground rose above 700 feet. Then another at 710 feet, inside the first ring on the map, since the area that is above 710 feet is smaller than how much of the hill is above 700. It goes like this until you reach the top of the hill, at the center of all the rings. When you have a slope, the lines denoting changes in ground level will be straight, kinda curvy lines. The steeper the slope, the closer together the lines are, because looking at the map is like looking at it from directly above, and you are not counting distance in length or width, but in height. So a cliff, for example, would have contour lines from many different ground levels converging into one line, since it's vertical and to a bird's eye view, they would overlap.