It's pretty simple to make. Just buy a kit with the jar, airlock, and instructions. After making it once or twice you can probably throw the instructions away. Chop napa cabbage, onions, slice carrot, whatever you want in it. Salt it, squeeze it, season it, and pack in the jar with that brine, lid it and wait with it stored in a cool dark area like a pantry. Two weeks minimum and you have delicious kimchi. That's pretty much all there is to it.