As we said there are many forms to drawing and each one has its own techniques and styles. These techniques give more elaboration on the designs drawn using various pencil strokes. You can create volume, texture and light to the images that are drawn.
With all these techniques, each person adapts to one majorly based on their interest and learning ability. There are few others who use every bit of each of the techniques and give an output that is totally out of the world.
Basically to start any drawing we need a sketch of the outline first, to roughly put on the subjects you would love to have on the page. And all these are mostly done using a pencil that is the most widely and commonly used medium for drawing.