In one sentence, describe what the following article is about:

When your hair follicles get warm, they open up, which allows them to become more flexible and easier to control. But if you apply too much heat, it can damage your hair and make it frizzy and unmanageable. Medium is usually a good heat setting to dry your hair without frying it.  If your hair dryer has 3 settings, the middle setting is usually the best. If your hair is healthier, you can use a higher temperature. For fine, weak, or brittle hair, use the lowest heat setting possible. If you hold it too close, the hot air can burn your hair and/or scalp. Use a brush, comb, or your fingers to pull your hair closer to the blow dryer if necessary.  Avoid targeting any single area of hair for too long, as this can damage your hair and cause it to be flat and limp. Keep moving the blow dryer around, aiming the airflow parallel to the section of hair you're drying.  Dry your hair from roots to ends, keeping the dryer behind your brush, comb or fingers, whichever you're using to style your hair. You can also wave the hair dryer back and forth to avoid directing the heat onto a single spot for too long. Use a comb or brush to grab the hair and help you control it while drying it. If you don't have a brush, use your fingers and tug the hair gently in the direction you are drying it. Move from roots to tips for more control and less frizz.  To give your hair more volume, angle the airflow upward from underneath the section of hair you want to give volume to. This will push the hair upward and help it set with more volume. It's best to use an air flow attachment nozzle to do this, as it makes it easier to direct the air flow onto your hair. To give your hair less volume, angle the airflow downward from above the section of hair you want to lay flat. This will push the hair downward and help it set closer to your crown. Most blow dryers are sold with an attachable air concentrator nozzle, which can be clipped onto the end of your blow dryer for more control of the airflow. Angle the blow dryer up from beneath your hairline so the air is pushing your hair upward. Use your fingers to gently lift and tug the hair at the front of your crown upward while you dry it. This will create a natural lift and add volume to the front of your hair. For even more volume, use a round brush to pull the hair up and away from you while drying. If you're in a hurry or don't want to spend a lot of time fixing your hair, this is an easy way to give your hair more volume with less hassle. Focus the blow dryer on the crown of your head first, using your fingers to gently tug your hair up at the root while drying. This will add volume to fine or limp hair and create a more natural, textured look.

Summary:
Set the blow dryer to medium heat. Position the blow dryer 6–8 inches (15–20 cm) from your hair. Use the pressure of the air to push your hair in the direction you want it to lay. Use your fingers to lift your hair in the front. Flip your hair forward and blow dry it from underneath.