Apps the help to understand camera settings?

The best way to learn is to get out and shoot, figuring things out with your gear will help you a ton, but a quick google search about basic camera settings should give you some nice videos/articles to read.

YouTube “how to use (Insert camera here) settings” goes a long way

This is what I tell my friends when handing over my camera and it seems to stick with them:

Aperture - how big the hole is exposing your lens (lower number means bigger hole = more exposure)
ISO - sensitivity to light. lower ISO for bright conditions, higher ISO for low light
Shutter speed - how fast the camera processes a shot. Higher speed for action sports shots, lower speed for long exposure shots (waterfalls, stars, etc.)

this might not make any sense to you and if so i apologize but eheath really said it best, get out and shoot and experiment with your camera. the more you do it the more it will make sense and youll know which settings to choose for certain shots

something these others haven't touched on is the difference between video and photos. its the same stuff, just different purpose.

-when filming, you want your shutter speed to double your frame rate. for example, if you're filming skiing at 60fps, then u want ur shutter speed to be around 1/120. this is what the human eye basically sees. 24p, 1/50 shutter, etc.
-your aperture, or f-stop, is how much light ur lens lets into the camera. the lower the number, the more light coming in. the lower the number the more depth of field u get, which can make focusing tricky. the higher the number, less light, but less depth of field so almost everything is in focus.
-iso is just the cameras way of digitally brightening what its seeing. keep ur iso as low as possible to avoid grainy noise in your footage/pics. the higher the iso, the lighter the image will be, but it hits a wall where ur image becomes unusable because the camera is just making up the light digitally.

when i film skiing, ill set my frame rate and shutter speed and leave them. ill play with aperture to get the lighting right, and if its dark, i might turn the iso up a little.

when i take pictures of golf, i set the aperture wide open so i get lots of depth, then crank the shutter speed until the lighting looks good in the shot. this makes freezing the moment in time great because the shutter is lightning fast.