Investors should invest on what they know. The biggest mistake is to invest on what they don't know.

The biggest mistake to me is complacency.

The biggest mistake we made at WordPress.com in term of infrastructure was buying servers.

Simply put, investors should own less equities, more bonds, more global investments, more cash and more dry ammunition.

Investors should be cautiously positioned as the global economy and markets face major uncertainties. The downgrade will be a further headwind to growth and job creation in the U.S.

That was the biggest mistake I've made. If I could do one recruitment over, it would be Adrian Zamora.