Being the first Product Manager (PM) in a startup can be challenging but also rewarding. Ben Erez, an experienced PM, shares his tactics for setting priorities, navigating founder dynamics, and turning chaos into clarity. Key insights include setting up efficient product processes, embracing scrappy data collection methods, partnering with founders to align vision and execution, leveraging limited resources creatively, and prioritizing high-impact features over perfection. By following these strategies, first PMs can successfully navigate the startup environment and contribute significantly to product success.