Make required password 8 characters minimum and include symbols

How can I make the required minimum number of characters 8, a user is supposed insert when creating their password and have them include symbols. The DB I’m using is Firebase, if that’s of any use.

P.S - an in depth explanation of how to achieve this (possibly in video) would be helpful, not just a screenshot of an arrow pointing at something, because I’m learning the platform. Thanks.

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