69 Guides

5 Topics

100% Free & Open Source

Interactive Learning

Every guide includes hands-on components to reinforce what you read.

Knowledge Checks Test understanding with quizzes after each section

Simulated Terminals Watch commands execute step-by-step with explanations

Hands-on Exercises Solve real scenarios with progressive hints

Code Walkthroughs Step through scripts line-by-line with annotations

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Shell Basics

How the shell works under the hood - startup files, PATH, variables, and expansions. Includes interactive quizzes, exercises, simulated terminals, and code walkthroughs.

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Topics

Linux Essentials 12 guides from shell basics to scripting best practices

DNS Administration 8 guides from fundamentals to architecture and operations

Git 17 guides from version control basics to internals and scaling

Databases 17 guides from relational fundamentals through NoSQL and operations

Perl 15 guides from Unix foundations to web frameworks

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