best way to build credit score?

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i took a class with Richdad poor dad a while ago and the guy said that you want to have as many credit cards as you can get.  i have heard that having too many credit cards hurt your score.

so my question to you is, what is the  best way to build it?  how long before i can spend 30k?

if i used my credit card to buy gas today should i make the payment the same day or should i wait longer?