The first type is vatakrama in which you sit cross-legged on the floor and breathe with a relaxed mind. Your inhalation should be passive and your exhalation should be active in this type of pranayama.
The second type of kapalbhati is vyutkrama. In this technique, you sniff in water through your nostrils and let it go into your mouth, and spit it out. This is a little difficult for beginners of this yoga as we know there are many kapalbhati benefits and dangers. So, this technique is a bit dangerous for beginners.
Lastly, there is the vyutkrama, the opposite technique and that is sheetkrama. In this type you take in water from your mouth and expel it through your nostrils. Kapalbhati benefits and dangers are side by side in this technique.