Elon Musk

Work hard, like, every waking hour. That's the thing I would say, particularly if you're starting a company.

Focus on signal over noise. A lot of companies get confused — they spend money on things that don't actually make the product better.

Don't just follow the trends. Think in terms of the physics approach of first principles — rather than reasoning by analogy, you boil things down to the most fundamental truths you can imagine and you reason up from there.