I'm a geologist, specialising in volcanoes and volcanic rocks, but I'm also very interested in all aspects of geology. On Wikimedia Commons I upload images of geology from many sources. I also categorise geology photos and add details to geology photo descriptions and locations.
Our first steps help file and our FAQ will help you a lot after registration. They explain how to customize the interface (for example the language), how to upload files and our basic licensing policy. You don't need technical skills in order to contribute here. Be bold contributing here and assume good faith for the intentions of others. This is a wiki - it is really easy.