The main categories include Initiation, Planning, Execution, Monitoring and Control, and Closure.

Key activities include defining the project scope, identifying stakeholders, and establishing project objectives.

Planning involves developing detailed project plans, setting schedules, allocating resources, and identifying risks.

Execution includes implementing project plans, coordinating team members, and managing resources to complete project deliverables.

Monitoring and Control consist of tracking project progress, managing changes, and ensuring project stays on track concerning scope, time, and budget.

Closure activities include finalizing all project work, obtaining formal acceptance, releasing project resources, and documenting lessons learned.