Using tmux properly
Yesterday I was helping a friend setting a box with no graphical session: I fired up tmux in the linux virtual terminal and then proceeded to realize without my tmux.conf I couldn't do a thing because I have always been using entirely different keybindings from the default.
This is the problem with too much customization. Learning to use the default configuration may be difficult but it's probably worth the effort, for vim it has definitely been in my experience.