Clone this wiki locally
To add or modify the content of specific parts of the website, only a few plain text files written with the Markdown markup language have to be edited.
There is one general rule for getting into editing:
Don't get afraid of the overwhelming number of additional documentation pages to the right. It all comes down to this: create a pull request and wait for a maintainer to approve. If you do not know how to do that, here are the three basic steps to follow:
Push your changes to your fork and open a pull request.
see Step 3 ff. in Contributor's Workflow
There is also a comprehensive guide from GitHub on sending pull requests.
Read the Rationale for details on the choice for Ruby/Jekyll and this procedure.