"My parents got no idea about photography, but as if they knew what it is that they put almost everything into my nickname they 've given (ALET, now a photographic acronym to me). It pretty much cover the whole concept, coming from the exposure triangle & to the brain of composition. Here it is,
Aperture(Av for Canon & A for Nikon)
Light(sensitivity or ISO)
Exposure(metering, the brain of exposure)
Time value(Shutter Speed, Tv for Canon & S for Nikon)
Now, coincidence or destiny? Only ONE knows."