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Operating System - Overview:
	https://www.tutorialspoint.com/operating_system/os_overview.htm
Types of Operating System & architecture:
	https://www.geeksforgeeks.org/types-of-operating-systems/
	https://www.technologyuk.net/computing/operating-systems/operating-system-architecture.shtml
Services of Operating System:
	https://www.geeksforgeeks.org/operating-system-services/
Process management & Scheduling algorithms:
	https://www.tutorialspoint.com/operating_system/os_processes.htm
	https://www.tutorialspoint.com/operating_system/os_process_scheduling.htm
	https://www.tutorialspoint.com/operating_system/os_process_scheduling_algorithms.htm
	https://www.tutorialspoint.com/operating_system/os_multi_threading.htm