What are the necessary components of a computer?

How many subsystems a computer has and what are they?

What softwares are system softwares?

What softwares are application softwares?

What is narrow sense OS and what is broad sense OS$?$

What is the relationship between a program and a process?

What is a PCB$?$

What type of information will be store in the PCB$?$

How many process states are there and what are they?

How is a process layouted in the main memory generally?