About 4 or 5 years ago I read an article on this site with many great tips for taking good digital pictures. The article had pictures that changed when you moused over them so that you could see the effects of the technique in question. Could anyone provide a link to that old article? I can't seem to find it.
If you just want modify your pictures with some clicks you could try to use photoscape. Photoscape is a easy-to-use photo editing tools which supports to enhance photos, combine, split, pick colour, merge photos to one page, etc.