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There are quite a few videos about Gateball on YouTube but you need to sort the chaff from the wheat.
The Gateball Referee Info Centre on YouTube has four very good ordered playlists of instructional videos The videos are very well presented and organised into playlists:
How to play Gateball. It has nine videos varying in length from 3 to 10 mins. so it doesnt take long to view them.
Swing Series It has 4 videos describing four different swing styles
Advanced Techniques has 4 videos covering Jump touch, Spark Swing and aiming methods
Complete Refereeing Course has 23 videos, some quite long, covering all aspects of refereeing.
It would be very worthwhile clicking the Subscribe button at that site to get notice of any new videos that are added.
An Indonesian Gateball YouTube channel of videos by Raodah Gateball Ainun might have some useful tips. Unfortunately not in English.
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