If you are using the leaves for wrapping fillings, you will want to remove them whole from the head of the cabbage and follow the recipe instructions. This may include blanching them or removing the thick rib that attached it to the core.
If you are chopping or slicing the cabbage, cut it in half right through the core. Then, cut the core from the cabbage and chop or slice according to the recipe directions.
I like slicing it very, very thin for slaws. You can also cut the cored cabbage into chunks and feed them through the tube of a food processor, using the shredding or the slicing blade. The shredding blade will give you pretty finely chopped cabbage, so make sure that’s what you want.
Notes
Once your cabbage is washed, sliced or shredded proceed with the specific recipe directions.