There are many Web editors, both free and commercial.
Dreamweaver is the most widely used HTML editor and is available in most of the public labs at Penn State. There is a very complete guide to the Dreamweaver program included with it. Go to the pulldown menu Help and open Tutorials and/or Reference to find how to use the program effectively and efficiently.
You can also do all your Web markup in a text editor, like NotePad (PC) or TextEdit (Mac) or free editors like Komodo Edit (Linux, Windows, Mac), TextWrangler (Mac), NoteTab (PC), HTML-Kit (PC) and jEdit (Linux, Mac, Windows). All are free downloads. If you are using Windows, Microsoft Expression Studio Web is also an good web editor.
Please don't use a word processing program like MSWord or WordPerfect, saving your files as HTML. They introduce unnecessary markup which makes them hard to edit by hand.