A project manager is responsible for defining project objectives and plans, organizing resources, monitoring progress, and taking corrective actions. Key responsibilities include interpreting requirements, authorizing work, demanding program baselines, and coordinating teams. Effective project management requires proper planning, scheduling, budgeting, risk management, and communication throughout all phases of a project. Common pitfalls to avoid are inadequate planning, failure to manage work plans, poor communication, and lack of quality control. Project managers use tools like Gantt charts to help define tasks, assign responsibilities, and track progress against milestones and deadlines.