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

Once you are in the pool, move your legs back and forth in a scissor motion, keeping them straight but not rigid. Then put both arms in the water and gently wave them back and forth horizontally, as if you are smoothing out the water beneath you. Kicking properly is a very important part of swimming, and it can be easier to develop your technique when you don't have to think about your arms at the same time. Get a kick board or pool noodle and use it to support your upper body in the water while you move yourself forward with your legs. You can do this while standing in the water until you get comfortable, then combine it with kicking to move through the water. Move your arms forward in alternating circles with your hands slightly cupped. Try to "scoop" the water backwards as you move your arms.Keep your arms as straight as possible, and extend them as far as possible when reaching forward.

Summary:
Practice treading water. Swim with your legs while holding onto a flotation device. Work on your arm strokes.