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I believe it's a paraphrasing of Warren Buffett's "invest in what you know". https://abcnews.go.com/Business/wireStory/latest-berkshire-h...

I think Peter Lynch said that.

Uber is definitely undervalued on HN. They have so much more markets to enter.

If your business loses money on each transaction, entering more markets isn't going to save you...

They are expanding agressively, that adds to the cost, they could also increase prices. I'm not worried at all.

You are correct if your goal is to maximize the amount of money you have.

First rule is: invest in something you understand.