Links Within a Page

How can we make hyperlinks within a page, to access further down on the page? For example, if I am talking about A, B, and C and have a lot to say about each on one page, how can I make bookmarks to mark particular sections (i.e. B or C) and create hyperlinks at the top of the page to connect me directly with those bookmarks (at B or C) without scrolling through the whole page?