Linux is a Unix-like operating system used on servers, desktops, cloud platforms, embedded systems, and development environments. The quickest way to become comfortable with it is to learn the filesystem, shell, permissions, processes, packages, and networking basics.
Start with the shell
pwd ls -la cd /path cp source destination mv old new rm file
Understand permissions
Files and directories have owner, group, and permission bits. Commands such as ls -l, chmod, and chown help inspect and manage them.
Processes and services
ps aux top systemctl status service-name
Packages
Use the package manager supplied by your distribution, such as apt, dnf, pacman, or zypper.
Networking
ip addr ip route ss -tulpn
Use man, --help, and the distribution’s own documentation whenever you need the exact syntax for your installed version.