Well each effects how much light gets to the camera...ISO determines how fast the camera absorbs lights. Aperture is how wide the lens is open, a more open lens means more light.
NOTE: with aperture, the lower the aperture number for example f/1.2 means that it is opened up wide, and a high number aperture like f/32 means its a tiny hole so not much light can get in, and lastly there is shutter speed...this is just how fast the shutter is, a slower shutter allows for most light to come in.
Okay now that that is out of the way, Aperture controls your depth of field (DOF)...a low aperture will give you a shallow DOF think one thing in focus and everything is is blured, you might want this for portraits.. a high aperture will mean more things are in focus, this is good for landscapes. Most lenses are sharpest at f/8.
With shutter speed, a slow shutter will allows for things lie light streams, because the shutter is open while motion is happening it captures everything. a quick shutter will freeze the motion think a humming birds wings. as the shutter gets slower you will need a tripod to get usable photos or night shots. Shutter speeds on your cam probably says 60..500..1000..etc. this is really 1/60 of a second 1/500 of a sec and 1/1000 of a second the higher the number the faster it is. I can shot about 1/6-1/10 of a sec handheld at the slowest, but I try to avoid it. Lights and water and some of the things that shutter can effect how the picture shows up.
With ISO, this controls the amount of noise or grain in your picture, of course you dont want any in your pics, but in order for you to get the aperture or shutter speed you want you will have to adjust the ISO, for example on thrusday I was trying to shoot humming birds, and even tho it was bright sun out I put my iso to 800-1600 so that I could get a 1/8000 shutter to try to frezze the wings, or if you dont have a lot of light and you want to take pics of a group of people, a low aperture will allow enough light in, but most likely only one person will be in focus, so you might up the iso so that you can get a higher aperture.
Added some pics
Being able to master these will just give you the option to control how the photos come out...
Also, if you are shooting a portrait, put you focus point on the eye
Also again different cameras have different ISO performance, so you might want to look into the camera you want performance when it comes to iso, I know when I have the T3 1600 was probably the highest I could have, and even then it would come out iffy, this shot was at 4000 ISO at 1/10 of a sec, now its not the cleanest pic, but the lighting was really bad, and it was at a restaurant downtown San Diego and flash was not an option, so if I still had the T3 I would have been shyt out of luck...like I said it wasnt the best pic, but it was workable
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