You know only DS & Algo? Nothing else?
Read these:
- https://www.tutorialspoint.com/computer_fundamentals/index.htm
- https://www.tutorialspoint.com/software_engineering/software_development_life_cycle.htm
- https://www.tutorialspoint.com/sdlc/index.htm
- https://www.tutorialspoint.com/operating_system/index.htm
- https://www.tutorialspoint.com/design_pattern/index.htm
- https://www.tutorialspoint.com/software_architecture_design/index.htm