An interactive guide · macOS · Windows · Linux
Talk to your computer in plain text.
Most terminal tutorials hand you steps. This one hands you concepts — what the terminal actually is, where bash and PowerShell came from, and why the same command behaves the same on a laptop in Brooklyn and a server in Frankfurt.
Color is part of the lesson
You
The human typing. Decides what should happen.
Shell
bash, zsh, PowerShell. Reads what you typed.
Kernel
The core of your OS. Talks to hardware on your behalf.
Filesystem
Folders and files. The same ones Finder / Explorer show.
Process
A running program. Commands launch and finish processes.
The whole loop, in one place.
Learn the mental model, drill the commands, then prove you've got it. Each module stands alone — read in any order.
module · read
Concepts
A field-guide to the parts: terminal vs shell vs kernel, where bash and
PowerShell came from, what a "current directory" actually means. Diagrams
you can squint at and finally understand.
you → terminal → shell → kernel → files
Read the concepts
app · do
Playground
A simulated terminal in your browser. Guided lessons walk you through
25 commands, step by step. A free-play tab gives you a real sandbox
filesystem to poke at — no risk to your machine.
~ $ mkdir practice && cd practice && touch hello.txt
Open the playground
drill · practice
Recall Mode
Scenario → blank input → escalating hints → reveal-the-why.
Testing-effect drills across the core commands.
Start drilling
guide · teach
Facilitator Guide
Printable lesson plan for a 60-minute class. Pacing, exact prompts,
common pitfalls, and what to say when a student panics.
Read the guide
rubric · measure
Mastery Assessment
Challenge tasks, a four-level rubric, a self-check the student fills in,
and oral questions for the instructor.
See the assessment
outcomes · scope
Learning Outcomes
Twelve skills and six mental models students leave with, plus the
explicit "not yet" list. What this course does not promise.
Read outcomes
rubric · stress
Tilt Rubric
Resilience-under-pressure scoring. 1–5 calm-to-crash across eight
scenarios with an interactive seismograph scoring sheet.
Score a session
i.
Start with why.
Open Concepts first. Five minutes of mental model saves an hour of confusion later.
ii.
Type, don't read.
The Playground simulates real commands. Make mistakes. Look at the error. Try again.
iii.
Recall under your own steam.
When a command feels familiar, drill it in Recall. Pulling from memory is what wires it in.