Linux

First practical step: install a distro and open your first terminal session.

In Linux everything is a file — knowing the tree lets you move with confidence.

Creating, copying, deleting, and reading files is your daily work on any server.

The permission system is the first line of defense protecting files and users.

Linux's real power is piping small tools together to process huge data.

Any real server is shared by many people — you must manage their accounts and access.

Installing and updating software safely goes through a package manager, not manual downloads.

Know what's running and consuming CPU/memory, and control it when the server hangs.

A server without networking is dead metal — you must understand and diagnose connections.

You manage real servers remotely over SSH — this is a core, non-optional skill.

Automating repetitive tasks saves time and removes human error on the server.

systemd controls service startup and boot on most modern distros.

Backups and periodic cleanup must run by themselves at set times.

A server exposed to the internet is a constant target — hardening protects it.

When a server slows down, you must quickly pinpoint CPU, memory, disk, or network.