HELP! i was told about a card stack where you know the order of the pack and its position in the pack. E.g, 10 of hearts is the 21st card down. what is the name of the stack and where can i learn ? thanx for all help in advance.

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There are many such stacks, too many to name. Just pick one and learn it. The best, most undetectable stack is to shuffle the deck and memorize it. Yes it will require work, but if that's what you want to do it'll be worth it.

Get the book Mnemonica.

aronson stack. There is a free booklet on it at his website.