Tracking customer retention is essential; it helps you understand how many users continue to engage with your product over time, which is a key indicator of success.

Use tools like Mixpanel and Amplitude for retention analysis; they provide valuable insights into user engagement and retention over time.

It's important to build your own cohort retention curves using your logs or Google Sheets to develop a better understanding of your data.

Using surveys to gauge product-market fit can be biased; instead, focus on measuring actual user retention.

Retention should be analyzed by looking at cohorts of users over time, assessing how many continue to use your product after signing up.

It's important to observe how people use software in real time, as this can provide valuable insights that metrics alone cannot capture. Relying solely on metrics to understand user behavior is like observing raw data from a radio telescope instead of experiencing the night sky directly.

Measuring retention is critical; if you don't have a product that retains users, you shouldn't focus on growth yet.

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

When you're a non-technical founder, demonstrating user data is crucial; it proves that people are using your product and validates its usefulness.