It is most often used to highlight quotations that are nested within other paragraphs. In the 1880s, Emperor Norton I, San Francisco's beloved eccentric, held court on Rincon Hill and proclaimed that a bridge would someday begin from the spot where he stood. It eventually was, but the hill had to go to construct it. It is most often used to highlight quotations that are nested within other paragraphs. Note that blockquotes can also be nested within themselves, as this example illustrates.
Links are simple enough.
There are two basic kinds of files that you will be using. And let's say you saved that file as favemovies.html. It's that simple. The process is basically the same if your link goes off-site to another Web page that you want your readers to see.