No need for hard concepts.
I am talking of things like "opsie, I don't want to commit this yet" (git reset) and "destroy all my work" (git reset --hard) being a command line switch apart. That's just wrong. That's so wrong I keep git reset --hard safety net around, in fact. https://gist.github.com/chx/85db0ebed1e02ab14b1a65b6024dea29