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Generally, you want to keep this to a low to medium amount, because you probably won't ever need this to be super high. The cloud setting effects how detailed and nice the clouds look. Smoothing helps make your aim more stable. It may sound nice, but it tends to make the crosshair sporadically move around many times, so it is best off. This setting moves your crosshair around depending on where your gun is pointing. This will make the game much brighter, and easier for you to spot bad guys. Some people prefer to have this set to a larger scale, but it should be smaller to avoid clutter on your screen. Things like your health, ammo, stance, etc. This graphics setting will let you adjust how sharp and crisp the game looks, a crisper looking appearance will help you a lot when trying to see things in-game. This is another graphic setting, and this one sets how much grass is shown on the ground. Preferably, you should have this disabled so that everything is easier to see, and the game will perform better. However, it can make the gameplay a bit awkward and clunky, so it's best to have it off. You can now look around using your mouse. Now with it on, you can freely look around anywhere when using a vehicle without having to press a separate key.
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This is a setting that lets you look around when inside a vehicle.
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