I only intend to be a casual Wikipedia editor, but I will help in three main ways:
Some cleanup: I will fix typos on sight, and time permitting I will fix grammar, add relevant tags where a page needs improvements and work on formatting and layout problems.
Photography: I am happy to be 'commissioned' (for free) to take any needed photographs in my local area. I will also attempt to keep an eye on Wikipedia's requested pictures and help out where I can.
Graphic design: I am a competent amateur graphic designer, willing to be 'commissioned' for diagrams or illustrations. I have vector skills (Inkscape, Illustrator), image editing skills (Photoshop pro) and 3D skills (LightWave).
In the page history for any page, click (prev) (#9 on the image top right—click on the image to see a larger version) to see the changes for any version from the one just before it. To compare a series of versions, just click any two radio-buttons to select the set of versions, then click the Compare selected versions button (this only works if you have JavaScript enabled).
You should be presented with a screen that shows you which words have been removed and which ones have been added (affected words are highlighted in red). You always can revert to an earlier version by selecting it from the history, editing and saving it. We call these "diffs" because the URL has the word "diff" in it. Diff is short for difference.
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