W3 Schools is a website with free HTML learning tools that help people understand, memorize and eventually develop their own Web pages quite easily at their own pace. With exercises, quizzes and tests, people may also integrate their skills with more complex tools such as HTML DOM, DHTML, XHTML and cascading styles sheets (CSS). The website also has learning tools for more advanced users, as well. Dynamic Web pages (updated Web pages, for example) require an entire skill set people can learn to use on this website.
Microsoft has a collection of reference sheets, tutorials and other HTML learning tools used by both Web developers and novices alike. You can access any number of study guides and exercises on the MSDN website. Many beginners often start learning HTML by learning the differences between tags, attributes and elements. For example, a paragraph tag (<p>) is an example of an HTML element (it sets up a paragraph format for text), while an anchor tag (<a>) is an example of an attribute (it may situate a hyperlink into a Web page).
Many community colleges or public libraries have free HTML learning tools and resources for anyone who asks. You do not have to be a student to review material either. Adult education centers sometimes have free classes, books or software you may even be able to borrow, as well. Universities or trade schools sometimes sponsor programs with local workforce agencies to help community members build more technically based skill sets -- they may have free HTML learning tools available onsite or online, for example.
Staffing firms sometimes have a large libraries of free learning tools available to either current or prospective employees. What is available may depend on the company policy. Companies such as Adecco, Randstad, Spherion and a host of others allow people to view their training material that, in all likelihood, has HTML exercises or quizzes, too. You'll most likely have to contact an agency representative and register for the company services before you can find free HTML learning tools.