Add the garlic, ginger, and red pepper flakes. Cook 1-2 minutes.
Reduce the heat to medium low. Add the cabbage and soy sauce. Cook until wilted, 15-20 minutes.
I have used this recipe with green cabbage, savoy cabbage (photographed here), napa cabbage, and even purple cabbage. It comes out great with all the different types of cabbage, but they each have different cook times. The purple cabbage takes the longest.