The key idea of the video is that startups need to focus on finding product market fit, cutting burn, achieving sustained growth, and generating revenue for users in order to attract investors and succeed.
Founders who have spent their initial angel round without finding product market fit struggle to justify why their company deserves more money, even though it's easier to raise funds if they have achieved something with the initial investment.
Cutting burn and trying to get to break-even is often the right thing to do if you have a hit product market fit for the first one to two million dollars.
The speaker made many mistakes while pitching a website that had half of its usage for spreading copper and content that investors could easily access.
Startups at YC's program raise money after 12-24 months, and at the kickoff meeting, everyone shares their revenue, making it an exciting and unique experience.