Move fast. Speed is one of your main advantages over large companies.

Really dig into projects people have worked on and call references; that is another thing that first time founders like to skip.

If it takes more than a sentence to explain what you are doing, it's almost always a sign that what you are doing is too complicated.

... for the top twenty most valuable YC companies, all of them have at least two founders.

You have to be intense. This only comes from the CEO, this only comes from the founders.

Someday, you need to build a business that's difficult to replicate. This is an important part of a good idea.

If you don't need it yourself, and you're building something that someone else needs, realize you're at a big disadvantage.