Be cautious with paid growth, as it can be risky; if you pay for users who don't generate enough revenue, you could run out of money.

Understanding the retention rates of both paying and free users is crucial for identifying growth opportunities and addressing potential issues in user engagement.

If users refuse to pay, it indicates that you haven't built enough value into your product or you're targeting the wrong customer segment.

Be cautious of measuring retention over too long a time period, as this can artificially inflate your retention metrics and mislead you about user engagement.

To determine if users are getting value from a product, simply measuring engagement, like watching more content, can be misleading; for example, watching fight videos may not reflect true user satisfaction.

It's important to choose meaningful actions for measuring user engagement; simply tracking app opens can lead to misleading retention metrics.

Retention is a critical metric; it shows how many customers continue to pay over time, indicating the product's value to them.

Your primary metric must capture whether your product provides recurring or enduring value to users, such as monthly recurring revenue for SaaS tools.

In hindsight, we didn't track revenue effectively; we focused on usage metrics, which made it unclear how many monthly active users we needed for fundraising.