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A Class is more than just the name of an element, it is a title you create that can be added to other elements that you'd like to be styled the same way. Notice that if you select this paragraph, and change it, it will effect the paragraph below as well, since they have the same Class.
By now you may have noticed that web design, simply put, is a series of boxes inside of boxes with text and images inside of them. Try selecting the parent element of this text Right 2 then changing the text alignment.