Great visual resource for newcomers and those interested in understanding more advanced functionality.
git
Folio
Simple visual version control tool for Mac based on Git
Git FAQ
Help without manpages
shortcutFoo
via @h3h
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 – the simple guide
Git Immersion
“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.”