Product definition and design: product planning, product design and function optimization, writing requirements documents, online feedback and BUG tracking.
Project management: make plans and follow up, determine resource input, control quality, write weekly reports, etc.
Product life cycle management: manage all activities and marketing of products from birth to extinction, make operation plans and provide customer service training. These contents are only a summary of the work of the product manager. In fact, the work of the product manager is much more trivial. If you want to have a more comprehensive understanding of what a product manager does, I recommend you to take a look at the product manager course of Chanz Education, which will definitely bring you more thoughts.