Stuff You Probably Didn't Know about Markdown and GitHub

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from Basic writing and formatting syntax - GitHub Docs

WIP.. 

Once you get to an advanced enough level:

GitHub offers a number of different security features that you can enable for your repository to protect your code from vulnerabilities, unauthorized access, and other potential security threats. Many of these features are available for free for public repositories.

At a minimum, you should enable the following for your public repository:

• Dependabot alerts notify you of security vulnerabilities in your project's dependency network, so that you can update the affected dependency to a more secure version.
• Secret scanning scans your repository for secrets (such as API keys and tokens) and alerts you if a secret is found, so that you can remove the secret from your repository.
• Push protection prevents you (and your collaborators) from introducing secrets to the repository in the first place, by blocking pushes containing supported secrets.
• Code scanning identifies vulnerabilities and errors in your repository's code, so that you can fix these issues early and prevent a vulnerability or error being exploited by malicious actors.