To protect your personal information, you should keep both your GitHub account and any associated data secure.
Your security on GitHub, as well as every other account you have on the Web, is best served with a strong password that isn't shared with any other person, service, or site.
GitHub credentials include not only your password, but also the access tokens, SSH keys, and application API tokens you use to communicate with GitHub. Should you have the need, you can reset all of these access credentials yourself.
You can create a personal access token and use it in place of a password when performing Git operations over HTTPS with Git on the command line or the API.
To keep your credentials secure, you should regularly audit your SSH keys, deploy keys, and review authorized applications that access your GitHub account.
You should review deploy keys to ensure that there aren't any unauthorized (or possibly compromised) keys. You can also approve existing deploy keys that are valid.
You can connect your GitHub identity to third-party applications using OAuth. When authorizing an OAuth App, you should ensure you trust the application, review who it's developed by, and review the kinds of information the application wants to access.
You can review your authorized integrations to audit the access that each integration has to your account and data.
You can review your account's security log to better understand the actions you've performed in the last 90 days.
If you commit sensitive data, such as a password or SSH key into a Git repository, you can remove it from the history. To entirely remove unwanted files from a repository's history you can use either the
git filter-branch command or the BFG Repo-Cleaner.
If you upload an image to GitHub, the URL of the image will be modified so your information is not trackable.
GitHub serves applications from multiple IP address ranges, which are available using the API.
If you're having trouble connecting to GitHub, you can troubleshoot your connection, then use the GitHub Debug tool to diagnose problems.
Public key fingerprints can be used to validate a connection to a remote server.
GitHub asks you for your password before you can modify your email address, authorize third-party applications, or add new public keys, or initiate other sudo-protected actions.
You may be alerted to a security incident in the media, such as the discovery of the Heartbleed bug, or your computer could be stolen while you're signed in to GitHub. In such cases, changing your password prevents any unintended future access to your account and projects.