I saw an answer to a question in "How to make a spiral out of a circle" (Create spiral out of circle), in which the person with the answer starts by drawing a single edge from the origin to a point along the X axis. (Please refer to the first answer to the question).
What are the exact steps to draw a single edge, starting at the origin and extending along one of the axes? Many thanks, and sorry in advance for such a simple question! (I tried extruding a point, and also creating an edge between two points, among other solutions, but nothing has worked so far).