What is the difference between the types of line that artists use when they make contour line drawing and sketches? help...

There are 5 main types of lines in art: vertical lines, horizontal lines, diagonal lines, zigzag lines, and curved lines. Other types of lines are simply variations of the five main ones. I believe this is what you’re asking but if you have anything else to ask let me know in the comments! Also apologizes for all the bot replies :)

What it's saying is that colored pieces of canvases is a piece of art