**Operating System**\n* Compiler, Loader, Linker\n* Process\n* Threads\n* Process Scheduling\n* Paging\n* Segmentation\n* Mutex/Semaphores\n\n**DBMS**\n* Normalisation\n* Locking\n* Concurrency Control\n* File vs DBMS\n* SQL vs NoSQL\n* Indexing\n* ACID Properties\n\n**Computer Networks**\n* OSI Model\n* Subnetting/ Supernetting\n* How Internet Works\n* Routing Algorithms\n* IPv4 vs IPv6\n* http vs https\n\n**OOPS**\n* Class\n* Object\n* Abstraction\n* Encapsulation\n* Inheritance\n* Polymorphism\n\n**Linux**\n* Inode\n* File Structure\n* Priority in Linux\n* fork()/ pipe()\n* Multithreading\n* How OS works?\n* Basic commands\n\n**System Design**\n* CAP theorem\n* Scaling\n* Load Balancer\n* Distributed System\n* Caching and its types\n* Sharding\n* API (REST vs SOAP)\n\nFeel free to add more important topics in comment section. All the best.

Operating System\n Compiler, Loader, Linker\n Process\n Threads\n Process Scheduling\n Paging\n Segmentation\n Mutex/Semaphores\n\nDBMS\n Normalisation\n Lockin