Using the viewfinder and heads up display can dramatically increase your 'good photo' vs 'bad photo' percentage. Instead of fumbling around with the menus in the back of the camera or the top display you should be using the HUD (heads up display) in the viewfinder ALL THE TIME. It provides the major settings and functions of your camera at a glance, without having to take the camera away from your eye!
Your camera may (or will) differ from this layout of the Nikon D3s. That's ok, just grab your owners manual or download it from your camera manufacturer's website and take a look. I promise, using these functions will give you a big advantage especially for sports or candid/photojournalistic photography.
BTW, stick around the last segment of the video to make sure you are holding your DSLR the RIGHT WAY.