Documenting with YARD uses YARD to generate all the documentation you see on the site. YARD is a replacement to RDoc, the classic documentation system, but adds many formatting and extensibility features that can make your life easier! YARD is, for the most part, backwards compatible with RDoc formatting. YARD, however, does not support directives such as :nodoc:, but there are alternatives (see the "Where is my :nodoc:?" article).

A good overview of the features added by YARD can be found in its README. Once you look over the basics, you will want to look at some examples of the formatting, which can be found in the Getting Started Guide.

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Setting up a .yardopts file - Teaches you how to add extra options (or files) when generating documentation for your code.