In what is a typical move for me, I have ignored an important issue in my rush to move onto the next big thing. Before I go any further, I must rectify this and talk about aperture.
Aperture refers to the little contraption in the camera that looks like an iris (in the eyeball, not the garden). Open wide means lots of light gets in, and closed up means little.
The really annoying thing is that the numbers on the camera are the opposite way around. Eg aperture F8 is almost closed, and F2.8 floods the light in. Can't believe I have been doing this course for 4 weeks and I still always turn the dial the wrong way.