Make sure to also check out part 2 of this tutorial, “Simple Doxygen templates” for many useful templates and tips.
This is a simple guide to basic use of Doxygen-compliant commenting of source code. The guide is written from my point – C/C++ – but it’s valid for all supported languages, except of Python. See Doxygen documentation for use for Python. Doxygen is very flexible when it comes to the form of how the documentation is written, the layout presented here is simply my preference.