I've gone through YC (W21). I've also coached 5 people and gotten them into YC.

Here's the advice I always give everyone:

The main takeaway of each answer should be said as quickly as possible right at the top. There should be 1-3 central things that we want to communicate – nothing more.

The following should be the goal for each answer:

• DEMONSTRATE THIS IS A $10B company!

• Informative

• No bullshit

• Authentic

• Math-backed

Review these resource:

• How to Apply and Succeed at Y Combinator by Dalton Caldwell, YC Partner

• Fundraising Vertebrae by me

• Why Your Y Combinator App Needs To Tell A Story by me

• How to Answer Questions on the Y Combinator Application by me