What is the Linux usages?
The question is unclear. Assuming you are asking usages of linux, well people use it for personal computing. Most of the companies use linux for servers. A Linux based system is free for anyone to use. A linux system distribution can be used in the same way as windows. Almost any application for windows has an equivalent application available for linux that does the same job. Linux has word processing, picture, sound and video edotors as well as their file format converters. It can be used to play many games, play song, watch videos. Linux is available for almost any personal computer available and almost any other computer in use. Most commercial network routers and firewalls are based on linux.