I was well into adulthood (I hear some friends snickering) before I could appreciate this preserved vegetable concoction. It's a perfect diet food (I know, I know, I promised not to mention the diet every day, but the early days are the easiest - you lose some water - and 4 pounds I might add). Hardly any calories to speak of, no fat, some spice (to taste), and a side dish/condiment that will last all winter in your fridge.
There are as many ways to make kimchi as there are to make chili or potato salad. I've made it maybe a dozen times, and never the same way twice. The napa is chopped and salted (maybe 2 Tbs total for the entire head), weighted down in a bowl and left overnight. (It's a good idea to cover it with a towel to keep out any detritus floating around your house.) Then drain and save the salty water that will have accumulated. Add other vegetation (scallions, carrots, and radishes for me). Add something spicy. I use chili/garlic paste. Toss the whole thing thoroughly, taste it for spice and adjust as you see fit, re-cover it and, except for tossing it once daily, leave it alone for one week. Now refrigerate it and start noshing it as you desire.