Hello Hive account@beautifulbullies. It's a bold step right direction you're taking. In other for you to understand your camera perfectly take it as a human eye. The key to taking a nice shot revolves around 1. ISO 2. shutter speed 3. Aperture.
ISO: It has to do with the sensiti ity of the camera body's sensor. How sensitive it is to light. Raising the iso makes the sensor more sensitive to light hence letting in more light but has a side effect of making the pictures or footage noisy or grainy
Shutter speed Deals with how fast or slow the camera shutter opens and closes. Determines how much light is captured. Fast shutter speed equals less light and slow shutter speed equals more light....

Fast shutter speed equals capturing fast moving objects and actions plus no image blur....
Slow shutter speed equals image blur and long exposure images
Aperture is a lens function. Opening up the aperture means opening up the lens to let in more light
So aperture doesn't have to do with the frame of the camera Closing the aperture means less light. Also it controls the depth of field.
Closing aperture helps you capture all in the frame...an aperture of f22 will capture both fore ground and background. But opening up aperture like f1.4 helps to create a shallow depth of field. Hence isolating both foreground and background to focus on the object you want. I can see someone becoming a pro. Photographer :) oh also shooting on raw gives you the ability to do what ever you want in post processing and still retain the detail of the image. You know we're using the same camera right?