There are a few things you need to know before starting to draw lines in Illustrator. First, the line width is important – it affects how easily the line can be drawn and how smooth the line appears. Second, you need to know how to make a start point for your line – this is where you’ll place your cursor when drawing. Finally, make sure that your line is long enough so that it covers the entire canvas (or at least most of it), and make sure that it’s not too thin or too thick.