Focus on building deep relationships with your first 1,000 users; this will help ensure your product truly meets their needs and can scale effectively.

Building a strong relationship with your first hundred customers can lead to organic growth as they share their passion with others.

Retention is the single most important factor for growth; if users don't stay, the business won't succeed.

It's important to evaluate startups based on whether they have a small number of users who truly love the product, rather than just a large user base.

At Y Combinator, we advise founders to focus on creating a product that 100 people love rather than something that 1 million people merely like, as those 100 passionate users can become your viral sales force.

Startups often churn as they grow, meaning that acquiring early customers doesn't guarantee long-term retention.

I encourage founders to stay in touch with their first 100 users, as it keeps you informed and connected to their needs.

The key to success is to engage with users and build what they want, which fosters loyalty and growth.

Sticky growth is about ensuring your existing users keep coming back and spending more. Delivering a good experience is crucial for retention.