Both knowledge and human connections matter—turns out, around my age, people are what it all comes down to.

Andy MacMillan, 42 | UserTesting, $84M annual revenue.

"Focus on building knowledge, but even more so on building relationships. At my age, you realize it's all about the people."

Here's what that means to me:

Don't expect books, movies, articles, videos, or lectures to fulfill your entrepreneurial dreams. Be a great friend to others, become a mentor—someone who can guide and be guided—and build yourself into a valuable business partner. Attract the right people, and you'll find that what matters most isn't what you know, but who you're with.