There're so many types of poi stalls and ways how to do them! Here's a set of tutorials to help you:
1. Introduction to poi stalls. Downward vertical stalls:
2. Upward vertical stalls:
3. Top horizontal stalls:
4. Simple poi stalls drill:
5. Antispin stalls drill:
6. 3 tips for clean stalls:
7. 5 poi stall tricks: