On the official site you can find instructions for some specific tasks:
User Clo maintains a tutorial which is based on the official help file. One of its features is an included screenshot for direct navigation to the descriptions of the TC features. Furthermore it contains information not available in the official documentation like missing INI-entries for example. The tutorial is up-to-date in English and French and available in HTML and CHM format.
User pdavit wrote an MS Word document for mastring Total Commander Directory Menu (hotlist)