qmk
How to make a new keymap
Qmk new-keymap -kb planck/rev6 -km kenny
This is saved in qmk_firmware/keyboards/planck/keymaps/kenny.
How to compile
Qmk compile -kb planck/rev6 -km kenny
How to flash the keyboard
Press reset on the back of the board.
Qmk flash -kb planck/rev6 -km kenny
Done!