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How to teach your betta to jump
Give your fish time to get to know you.
That is, don't start teaching your fish to jump the first day you get it. Let it come to associate you with feeding it, so it learns to trust you somewhat.
When the fish doesn't look scared when you're around and when it immediately pops up to the top of the tank when you want to feed it, it's likely getting used to you. Try to wait a couple of weeks before attempting to train it.