Exposure Triangle
Aperture (Also called F Stop or F#):
The aperture is based within the lens of your camera and can open and close to allow more or less light in respectfully.
The larger the opening, the lower the F Stop (F1.2, F2.8, F4, etc.).  The lower the number, more light is allowed into the camera's sensor.  
The smaller the opening, the higher the F Stop (F22 is the max).  The higher the number, less light is allowed into your camera's sensor. 

Shutter Speed (Seconds):
The shutter speed is you telling how fast you would like your camera to take a photo.
For a fast shutter speed make sure you set your camera to a fraction (ex. 1/4000).  The faster the shutter speed, the less light is allowed into your camera's sensor. 
For a slow shutter speed make sure you set your camera to a whole number (ex. 10").  The slower the shutter speed, the more light is allowed into your camera's sensor. 

ISO
The ISO is a setting telling your camera how sensitive to light your camera sensor is.  
The less sensitive you want your camera to be to the light the lower your ISO setting should be (ex. ISO 100).  The lower your ISO is the less grainy your photos are.  
The more sensitive you want your camera to be to light the higher your ISO setting should be (ex. ISO 12800).  The higher your ISO is the more grainy your photos are.  It's important to understand, every camera has a different effective range, and personally my camera (Sony A7III) has an effective range of ISO 100 - 10,000.  However, I limit my settings to 100 - 2000.  

Aperture: F22     Shutter: 1/160     ISO 1000     24mm
Sony A7III 16-35mm F2.8 GM

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