This course shows a Thunderbird Options dialog. You can select the sections and tabs of the dialog just like with the real dialog. When you click on an item, however, you are going to get a short explanation, and if you click on the "Show more" button there, if present, you get a multimedia presentation of what that optin does.
Note: I am aware of errors, of many, many ways where the presentation could be improved significantly, and even of some horrible usage of the English language. However, all of what you see already took A LOT of effort and time, and I wanted to release something, even if it isn't perfect.
You should have Mozilla Thunderbird installed, that is all.