Content is created in Markdown with JSX Extensions (.mdx) and placed in the <root>/content folder. The content begins with YAML "front-matter" holding the metadata of the page. While this all may sound fancy, for the most part it will be like editing any other .md file.
The package has been configured to support jest following the Gatsby Unit Testing instructions. The most important part of this was setting up gatsby as a mock so that you can mock graphql queries.
One major difference is that we use testing-library/react vs react-test-renderer, so we skipped those steps. We made additional changes with <root>/setup-tests.js in order to extend expects with the testing-library additions.