Same here. I read through the first 10 or so and hadn't heard or been taught any of them. Is it a particular US thing? (British here for reference)
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Mostly North American.
If you're interested, these videos explain and discuss each "trick" in more detail:
https://www.youtube.com/watch?v=1gxLwLBl4mM&index=4&list=PLA...
It's a work in progress...