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Pick something meaningful to you if possible such as your favorite flower or your dog. It is likely going to be easier for you at first to draw from a reference than from imagination, so drawing something you like will help you focus. When starting out, you don’t need specialty art supplies. Any pen, pencil, or paper on hand will do. Press your pencil lightly against the paper. Focus in on the line you will draw, forgetting what the subject is. Don’t think about your dog. Instead, start with an outline. The edge of your dog is a line between the dog and the environment. Make your line with short strokes.  The shorter you make your line strokes, the steadier your drawing will appear. Don’t critique your work. Move fast and hone your stroke. Once you have a basic outline of your subject, start drawing the interior. Search for landmarks on the subject, distinguishing marks such as a dent in a cup or a tuft of hair on a dog that will give you an idea of where to place nearby lines. Shading is a little more difficult, but it gives your drawings a sense of light and depth. Observe which way the sun shines on your subject. Start with a clean, sharp pencil and make even marks on partially dark areas. As the lead tip wears away, move towards the shadowed areas. Press harder to leave darker marks.  This can be practiced by doing a shading bar. Start at one end of the paper. Move your pencil back and forth as you move across the paper. Apply more pressure to transition to darker marks. Value bars are also good practice. Divide a rectangle into five sections. Leave one end white. Darken the other end as much as you can. Layer your lines in the squares in between to make different shades of gray.
Pick a subject you see. Draw short lines. Fill in details. Shade in shadows.