There are several ways to clone repositories available on GitHub.
当您登录到帐户查看仓库时，可以用于将项目克隆到计算机上的 URL 在仓库详细信息下方提供：
有关设置或更改远程 URL 的信息，请参阅“更改远程仓库的 URL”。
https:// 克隆 URL 在所有仓库（公共和私有）中提供。 These URLs work even if you are behind a firewall or proxy.
git pull, or
git push to a remote repository using HTTPS URLs on the command line, Git will ask for your GitHub username and password.
You can use a credential helper so Git will remember your GitHub username and password every time it talks to GitHub. For more information, see "Caching your GitHub password in Git."
To clone a repository without authenticating to GitHub on the command line, you can use GitHub Desktop to clone instead. For more information, see "Cloning a repository from GitHub to GitHub Desktop."
If you'd rather use SSH but cannot connect over port 22, you might be able to use SSH over the HTTPS port. For more information, see "Using SSH over the HTTPS port."
SSH URL 通过 SSH（一种安全协议）提供 Git 仓库的访问权限。 To use these URLs, you must generate an SSH keypair on your computer and add the public key to your GitHub account. For more information, see "Connecting to GitHub with SSH."
git pull, or
git push to a remote repository using SSH URLs, you'll be prompted for a password and must provide your SSH key passphrase. For more information, see "Working with SSH key passphrases."
If you are accessing an organization that uses SAML single sign-on (SSO), you must authorize your SSH key to access the organization before you authenticate. For more information, see "About authentication with SAML single sign-on" and "Authorizing an SSH key for use with SAML single sign-on."
Tip: You can use an SSH URL to clone a repository to your computer, or as a secure way of deploying your code to production servers. You can also use SSH agent forwarding with your deploy script to avoid managing keys on the server. For more information, see "Using SSH Agent Forwarding" in GitHub 开发者文档.
You can also use a Subversion client to access any repository on GitHub. Subversion offers a different feature set than Git. For more information, see "What are the differences between Subversion and Git?"
You can also access repositories on GitHub from Subversion clients. For more information, see "Support for Subversion clients."
- Working with Remotes from the Pro Git book site