Once you have your product vision and objectives, you need to identify the key product metrics that will help you track and evaluate your progress and performance. Product metrics are the quantitative indicators that measure the value and impact of your product. They can be divided into different categories, such as user, revenue, engagement, retention, satisfaction, and quality metrics. Depending on your product stage, type, and market, you may need to focus on different product metrics. For example, if you are launching a new product, you may want to prioritize user acquisition and activation metrics, while if you are scaling an existing product, you may want to prioritize user retention and revenue metrics. You can use frameworks like HEART (Happiness, Engagement, Adoption, Retention, and Task Success) or PIRATE (Acquisition, Activation, Revenue, Retention, Referral, and Engagement) to identify and prioritize your key product metrics.