rdware Protection Memory Management Paging, Segmentation, Paging with Segmentation Virtual Memory File Concepts Disk Scheduling Algorithms Disk Structure File Accessing methods Thus, the major concepts in Operating Systems are listed. If you need to know them deep, you can Google them or refer some books. They can help you better. The most interesting thing is, I secured First class mark in ‘Operating System’. One of my major papers in BCA. OS’s run in x86 protected mode which is a CPU mode that offers additional privileges and memory protection that wasn’t available to their older real-mode ancestor: Process Management and Task Management/Scheduling: Process - Technical Collection, Scheduling - Technical Collection, and 2. Processes Management Memory Management/Virtual Memory: 4. Memory Management and 4.4. Virtual Memory Management File Systems: 5. File System Management and File Systems | Operating System Interprocess Communication (IPC): Inter Process Communication Device Drivers + Interrupts: Interrupts - Technical Collection