System Admin: Hardware person need to know Latest and old Windows Operating System Linux(ubuntu, centos, others) Operating System Installation of windows and Linux operating system Networking knowledge, AWS, GIT LAN, Router, Switch configuration and installation Knowledge of computer hardware as like RAM, HardDisk, Motherboard, SMPS, and other parts Knowledge of repairing and replacing of hardware of both desktop and laptop knowledge of installation of different software for both Linux and Windows operating system