Terminal

How to use man pages effectively — understanding sections, navigating entries, reading the synopsis format, and finding the right documentation for any command, system call, or config file.

A practical guide to sed — how to find and replace text, edit files in place, delete and insert lines, and use address ranges to target exactly what you need.

How to use branches to work on features independently, merge them back together, and resolve conflicts when they arise.

Getting started with Git — creating repositories, tracking changes, and syncing with remote servers.

A practical guide to ss — viewing listening ports, active connections, filtering by state and protocol, and diagnosing network issues.

A practical guide to ps — listing processes, reading output, filtering results, customizing columns, and combining with other tools.

Understanding the Linux filesystem hierarchy, what lives where, and the essential commands for navigating the directory tree.

How Linux controls access to files and resources — users, groups, ownership, file permissions, and sudo.

How the shell connects commands together — standard streams, redirection, pipes, command chaining, and practical patterns for combining simple tools into powerful workflows.

How Linux manages running programs — viewing processes, controlling jobs, managing services with systemd, and understanding resource usage.

How software is installed, updated, and removed on Linux — covering package management concepts and practical commands for Debian and RHEL-based systems.

A practical guide to environment variables in Linux — how they work, how to set them, where they’re loaded from, and common use cases.

A practical guide to tar and gzip — creating archives, compressing files, extracting contents, and common patterns you’ll use daily.

A practical guide to using scp for secure file transfers between local and remote systems, covering common flags, patterns, and troubleshooting.

A practical guide to generating SSH keys with ssh-keygen, covering key types, common parameters, and best practices.