Instructions for contributing the to free and open source materials for teaching foundational computational and data science skills to researchers maintained by The Carpentries at https://software-carpentry.org/lessons/ and http://www.datacarpentry.org/lessons/
Expanded instructions (in the for_novice_contributors.md file above) for how to contribute to The Carpentries' free and open-source lesson materials.
See an overview of current lessons here and here, including links to lesson repositories on GitHub