Is it better to learn the arrangement or structure of cables?

I am an art major. I'd better start with structure sketch and learn perspective relations, and the proportion must be correct. First learn basic modeling, such as modeling and perspective of cubes, cuboids, cones and circles, and then draw a plaster statue and a portrait of a real person. If you are a graphic student, you should work hard on sketching. Sketching is often used when drawing a plan in graphic design. I suggest you learn modeling first, and you can only feel it if the modeling is accurate. When drawing cables, you should use large colors to roughly distinguish the relationship between light and shade.