I found one article, only one, that did more than anything to help me understand git. Can't find it anymore. :-( But it had to do with reflog and how any command could be undone since nothing was truly destructive, and how reflog actually had the edges in the graph and you just needed to know how to repoint them to the right nodes. Or something. This is probably one of my least helpful HN comments.

edit: It might have been this one: https://hackernoon.com/https-medium-com-zspajich-understandi...