I suffer every time a linux distro has nano as the default editor. Cant save a file, cant exit, have to read the two bottom rows and figure out those alien shortcuts. yuck
I did use emacs before i switched to vim 15 years ago. My memory is hazy, but i am pretty sure Ctrl-O to save a file and Ctrl-X to exit are not emacs bindings. I was as confused with nano when i used emacs as i am now.