Back in August and September 2010, I ran an introduction to photography course for the social website reddit.com/r/photoclass. It was in 30 parts, completely free and with no prerequisites.
With a few changes, all 30 lessons are now reproduced here in a more readable form.

This class is and will remain freely accessible, so enjoy and don't hesitate to share this page and to refer your budding photographers friends to it.

Bush plane in the Alaska Range

01 - On photography (it's not rocket science)

Part I - The Gear

02 - What is a camera
03 - Different types of camera
04 - Focal length

Part II - Exposure

05 - Exposure, pipes and buckets
06 - The histogram
07 - Shutter speed
08 - Aperture
09 - ISO
10 - Metering modes

Part III - Focus

11 - Autofocus
12 - Manual Focus
13 - Depth of Field revisited

Part IV - Using the Camera

14 - Flash
15 - Tripod
16 - Filters
17 - White balance
18 - Scene modes vs PASM
19 - RAW vs. JPG
20 - Film vs. digital
21 - The decision process

Part V - Post Processing

22 - Digital workflow
23 - DAM and Backups
24 - Levels and curves
25 - Layers and masks

Part VI - Vision

26 - Composition basics
27 - Break the Rules!
28 - Be inspired
29 - Share your work

Conclusion

30 - How to go further

Kids in the Santa Cruz valley, Peru