What do you understand about IT Project Management. Please answer below topics with minimum 200 250 words with intext citations

What do you understand about IT Project Management. Please answer below topics with minimum 200 – 250 words with intext citations and 2 references must.
· What is a Project and project management
· Phases of project management
· Why manage a project and Who manages a project
· What are the skills of a project manager
· Importance of project management in IT
· Three sphere model for system management
· The four frames of organization