GitHub Flavored Markdown is the principal creation tool for slide content within PITCHME.md. This is the same tool you use as a developer to create project READMEs or Wikis for your Git repos.
The Mastering Markdown Guide is a good resource to learn or refresh the basic usage of Markdown and the GitHub Flavored Markdown (GFM) extensions.
Use slide delimiters in your PITCHME.md file to split your markdown content across different slides.
GitPitch presentation slides can display a wide range of different content types, including Markdown formatted text, headers, quotes, links, lists, tables, images, plus code, videos, math formulas and more.
The guides that follow detail the capabilities and syntax for working with GitPitch markdown.