Something I wrote some months ago. Although the content is all very basic, I thought to put it here in case anyone was interested to read it. The link will take you to a page that has the preview image. Click on the preview to see the tutorial. Hope it'll be useful to you!

This tutorial covers some of the basics of photography with specific reference to low-light conditions that require long exposures. In addition to this, the tutorial also describes the use of Unsharp Mask and Curves in Adobe Photoshop, both of which are useful image-editing tools in night and day photography. Over 30 diagrams and example photographs are included to aid understanding and highlight important points.

It'll probably be updated sometime in the future with new images and more information.