Scott Chacon's videos are priceless. (He's the co-author of the git book.) They explain exactly how git works internally in the simplest terms possible. Either

Scott Chacon's videos are priceless. (He's the co-author of the git book.) They explain exactly how git works internally in the simplest terms possible. Either or both of these: Introduction to Git - talk by Scott Chacon https://www.youtube.com/watch?v=xbLVvrb2-fY https://www.youtube.com/watch?v=xbLVvrb2-fY Introduction to Git with Scott Chacon of GitHub https://www.youtube.com/watch?v=ZDR433b0HJY https://www.youtube.com/watch?v=ZDR433b0HJY The latter is newer but a bit longer. Don't be fooled by the video names, these are introductions to the internals not just the interface.