“Razors” are rules of thumb that simplify decisions.

The most valuable razors I’ve discovered:

The Smart Friends Razor

If your smartest friends are all interested in something, it’s worth paying attention to.

If that something seems crazy, it's worth paying a lot of attention to.

The passions of the smartest people in your circles are a looking glass into the future.

The Rooms Razor

If you have a choice between entering two rooms, choose the room where you are more likely to be the dumbest one in the room.

Once you are in the room, talk less and listen more.

Bad for your ego, great for your growth.

The Man in the Arena Razor

It's easy to throw rocks the sidelines—it's hard to step into the arena.

It's lonely and vulnerable, but it's where growth happens.

When faced with two paths, choose the path that puts you in the arena—choose the path with real skin in the game.

The Feynman Razor

Complexity and jargon are often used to mask a lack of deep understanding.

If you can’t explain it to a 5-year-old, you don’t really understand it.

If someone uses a lot of complexity and jargon to explain something to you, they probably don’t understand it.