The quote at the end, explains a little on how SV nurtures the entrepreneurial spirit: “One of perhaps the most compelling things about Silicon Valley is that it is a place where you can fail, and if you do, you can raise money and try again,” said Mark Leslie, a retired entrepreneur and lecturer at the Stanford Graduate School of Business. “It’s a miraculous place; the streets are lined with gold here.”
Often the followup question to what is the O notation of X is why? So if you are just going to memorize the cheat sheet then it won't get you very far.
It is good to know what you should know about though.