Great visual resource for newcomers and those interested in understanding more advanced functionality.
Simple visual version control tool for Mac based on Git
Help without manpages
Learn and practice keyboard shortcuts for a wide range of tools, including Vim, Sublime Text, Excel, Photoshop, the command line, Git, Gmail and more
“Git Immersion is a guided tour that walks through the fundamentals of Git, inspired by the premise that to know a thing is to do it.”