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

This is the level you’ll hang the curtain brackets at. The higher you hang the brackets, the larger your window will appear. Avoid hanging the brackets more than 8 inches (20 cm) above your window or your swag may look too high.  Make the marks with a pencil so they’re easy to erase. Don't hang the brackets less than 4 inches (10 cm) above the window or it may look too crowded. You want 1 bracket on either side of the window frame. Hold them so the screw holes are level with the marks you made earlier. Make sure the distance between the brackets isn’t greater than the length of the curtain rod or else the rod won’t fit. Use a tape measure to measure the length of the rod and then measure the distance between the brackets. If the distance between the brackets is greater, move them closer in toward the frame. Place the level between the bracket marks so the top edge is lined up with the each of the marks. Then, check the gauge in the center of the level — if the air bubble is outside of the marked lines, the bracket marks aren't level. If that's the case, redraw the bracket marks so they're level with each other. A pilot hole is a pre-drilled hole that makes it easier for screws to go into a surface. To drill the pilot holes, use a drill bit that’s slightly smaller than the screws that came with the brackets. Drill into the screw hole marks you made on both sides of the window. Hold the brackets on the wall so the screw holes are lined up with the pilot holes you drilled. Then, drill the screws that came with the brackets through the holes until the brackets are secure.

Summary:
Mark 4–8 inches (10–20 cm) above your window on either side. Hold the brackets on the wall above the frame and mark the screw holes. Use a long level to make sure the bracket marks are lined up. Drill pilot holes through the screw hole marks you made. Screw the brackets into the wall.