To avoid confusion, it's better to use nonsense constructions rather than real words. You might now want to try creating some tags and inserting them into your text to understand their functionality. If you don't see your work reflected in the browser, then reload the frame of the original page. So far, you've been authoring the initial course page. If you are still in Authoring Mode, you will now see three buttons allowing you to create, modify or remove course modules.
Topics make up the lessons and lessons make up the modules.
After you have created a module, you should see it has turned into a hyperlink on the main page and you can click on it to go to the next level down, the lesson level. Now, the buttons on the page offer you the option of editing an introduction and conclusion to the module and to creating, modifying or removing this module's lessons. Similarly, after you've created a lesson, you will be able to click on it and be offered the capabilitiy of making an introduction and conclusion to the lesson, plus the ability to create, modify or remove the topics that make up the lesson. After you have created the course materials, you can offer the course over the Internet. However, while offering it you'll want to communicate with your students.