A useful tip! I knew it was possible the change the case, but haven't looked into how to do it.
It's very easy when pressing the 'a' key while typing, to inadvertently catch the caps lock key, then when you look at the screen you find that you've typed a line in upper case. On my keyboard there is at least an LED that lights up 'A' in green to show that the caps lock is on, but not always noticed till it's too late. A bit of a nuisance at times for windbags like me, being better at verbosity than brevity. A sort of self-inflicted punishment I guess.
