For example, you can always head over to a site such as Wikipedia and search for plastering. After an initial search I come up with a page all about plasterwork. The page explains the basics of working with plaster such as methods of fill cracks and slabs. In addition, you will be able to learn more about plaster for decorative techniques such as pop corned, textured, and smooth, so you you must see this site. However, if I was a visual learner, this information may not be of much use to me.
In this case, I would more than likely head over to YouTube and search for a video that would show me the type of techniques that would help in my plastering project.