>>4066551Aperture is how big the hole that lets light in, is(1.8 is large, 8+ is small). Shutter speed is how long the camera lets light hit the sensor (usually measured in fractions of a second, eg. 1/80th of a second). Iso is how sensitive or reactive your sensor is to light (100 being low sensitivity, 800+ being high)
Iso is great when it isn't very bright outside, but as you turn it up it makes the picture grainy. At 400 it is very noticeable when you zoom in on your computer. Over 800 it becomes noticeable even when it's not zoomed in. For best quality, keep it low, and only turn it up if you can't see the image without it.
For shutter speed, for best quality, keep it fast. There are rules of thumb, like it should equal your focal length to be sharp, but you should keep it as fast as you can without it being too dark. Remember how iso makes you sensor more sensitive to light, well a shorter shutter speed means letting less light in for your sensor to react to. 1/150 means your pictures will be crisp even with a good amount of hand shake, or a bit of subject movement. 1/40 is doable if you are steady, 1/20 will almost certainly have a little blur and anything higher generally requires a tripod. The longer, the brighter, but the less sharp. If you can do 1/1500 and still see what you photograph, then do it.
Aperture is the trickiest one, as it usually requires an understanding of geometry, or a graph to really understand exactly what is going on. But aperture is the size of the hole that light goes in through. For general best results keep it as big as possible (weirdly the smaller the number, the bigger the hole, because it's actually a ratio og hole size compared to lens length and distance to sensor). The reason is that a bigger aperture like f1.8 will let more light in than a smaller aperture like f11. This means that when your aperture is big, you can turn your iso low for good clarity, and make your shutter faster for better sharpness, and still...
