Purpose of this phase
Prerequisites
Step-by-step practice tasks
Five short, concrete tasks per phase. Check off each step as you complete it.
Important terminology and tools
Safe educational simulator
This simulator never executes real operating-system or network commands. It returns predefined educational output only.
educational-simulator
Type help to display supported commands.
student@lab:~$
Select or run a command to see a beginner explanation.
Mistakes and best practices
Common mistakes
Security best practices
Interview questions and mini-projects
Interview questions
Mini-project ideas
Phase quiz
Questions are randomly selected and shuffled each attempt. You have 15 seconds per question — it auto-advances if time runs out. A 70% score is required to pass, and retakes are unlimited.