What is the technique to longer breath holds?

Howzit y'all! Different kind of video this time round, Im gonna try my best to answer this question, "what is the technique to longer breath holds?"
If you're like me back when I started diving, I was trying to find any answers or tips and tricks to increase my breath hold. So this is the answer I came up with and what I apply to myself when im trying to keep up my breath holds
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