Free · project-based · code-reviewed
Learn real computer science,
one minute at a time
Choose a browser exercise in C or Python and write your first program — no sign-up, nothing to install. Then build the real project in a repository of your own, with AI-assisted code review on your project work.
26 exercises · about 209 minutes in total · stop after one if you like
Watch the short lessons
One real computer-science concept at a time — from hardware up to running code.
Open the YouTube channelRather talk to a person first? An advisor can answer your questions and help you pick a track before you sign in to anything.
How it works
Watch. Practise. Build. Get reviewed.
STEP 1
Watch
Short videos, one real concept at a time — from how a transistor works to your first C program. Free to watch.
STEP 2
Practise
Short exercises that run in this page: write the code, press Run, see what it does. 26 of them across C and Python, each one preparing you for a specific project. No account, nothing to install.
STEP 3
Build
Then the real thing: a project with a brief and its project assessment criteria (what the review checks), in a private repository set up for you. You write all of it — the exercises were the rehearsal.
STEP 4
Get reviewed
Our AI-assisted review reads your project work and writes back: what is correct, what is fragile, what a reviewer would ask. Plus questions about your code that check you can explain it.
Start here
Write C before you commit to anything
26 short exercises that run in your browser. You write real C — pointers, arrays, bit manipulation, argv — and real Python, against a customer’s messy data. The runtimes stop on the mistakes a real toolchain lets through, in plain English: reading memory you never wrote to, running off the end of an array, an assistant citing a policy that was superseded a month before the claim. They are teaching runtimes, not the compiler or interpreter your project uses, and they say so on every screen.
Start free
Your first project costs nothing
Sign in with GitHub and we set up your first project from the C & Systems Programming (Zero to the Kernel) track — the same track our video series and the practice exercises build toward. No payment, no card, no typed usernames. All you need is a free GitHub account.
- ✓ A private repository with the brief and the project assessment criteria inside
- ✓ AI-assisted code review on your project work
- ✓ Questions about your code that prepare you for real interviews
- ✓ Your project repository is private; any public showcase is opt-in
How the repository works
- ·It is created inside the TechMonster organization on GitHub and you are invited to it — it is not created under your own account.
- ·It is private: you, and the people reviewing your work, can see it.
- ·Your commits are made under your own GitHub identity, and `git clone` gives you a complete copy, history included, that is yours to keep.
Plain words
What “reviewed” means here
Three different things get called the same word across this industry. We keep them apart, because they are worth different amounts to the person reading your profile.
- Checked
- Your code was run against tests and the results are recorded. That is what the practice exercises do, in your browser. It proves the program behaves, not that you understand it.
- Reviewed
- Your source was read and written about — correctness, structure, the things a reviewer would raise. On the project, AI-assisted review covers your project work.
- Explained
- You answered questions about your own code — why this approach, what breaks it, what you would change. It is the part an interview actually tests, and the part nobody can do for you.
Finishing exercises is not a qualification and we do not present it as one. The evidence is the work itself: the commits, the reviews, and your answers.
Real curriculum, in the open
This is not a video course
Behind the lessons is a full engineering curriculum: 24 specialization tracks and 1018 hand-authored projects — from C and systems programming to AI/LLM application engineering. Your project repository is private; any public showcase is opt-in. If you choose to share one, it shows the commits, the reviews and the answers, rather than a certificate. See a sample profile on GitHub.
Ready for the full journey — coaching, interview prep, and a track matched to your target role? Explore the Career Coaching Program.
TechMonster by the numbers
Live counts, not outcomes: we do not publish placements, hires, interviews or salaries. Counts under 10 are shown as “fewer than 10”.
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