Security awareness
The Urgent Request
Read a real-looking urgent message from your CFO, decide how to respond, and learn to spot the social-engineering red flags before you act.
3 min · 1 scenario
Jump straight in. It takes about 3 min.
// lab · interactive lessons
Learn by doing.
Short, hands-on lessons that run right in your browser. No setup, no account. Pick one and start clicking.
8 lessons · about 82 min · 3 crafts minutes · 3 crafts · no setup, no account
The mix · 82 min
- Learning design, 1 lesson · 3 min
- Software, 3 lessons · 21 min
- Music technology, 4 lessons · 58 min
Learning design
1 lesson · 3 min
Software
3 lessons · 21 min
Vibe coding · ages 13 to 15
Vibe Coding: Build by Describing
Pick what to build, then direct, test, and improve a real working example with the say, test, adjust loop.
5 min · 5 slides
Jump straight in. It takes about 5 min.
Computer science
Recursion, watch it run.
Step into a mirror, open nested dolls, write your first recursive function, watch the call stack, then grow a fractal tree.
6 min · 10 slides · checkpoint quiz
By the end, you will be able to:
- Explain what recursion is, in plain language.
- Spot the two parts every recursion needs: a base case and a recursive case.
- Write and trace a simple recursive function in Python.
- Describe the call stack, and why a base case is required.
- Predict what happens when the base case is missing.
Engineering · beginner friendly
Git internals, made visible.
No terminal needed. Take snapshots on a timeline and travel back, then see what Git really does: photos, movable labels, and merge versus rebase, all animated.
10 min · 11 slides · checkpoint quiz
By the end, you will be able to:
- Take snapshots of your work and travel back to any earlier one.
- Explain what a commit really is: a full photo of your files, not a list of changes.
- See a branch for what it is: a movable label, not a copy of your files.
- Read a commit timeline by following HEAD to a branch to a photo and the photo before it.
- Tell merge and rebase apart, and know which one is safe to use when.
Music technology
4 lessons · 58 min
Music technology · beginner friendly
Anatomy of a sound.
Hear what a sound actually is. Shape its pitch, loudness, waveshape, and envelope, then build a synth and play a short tune. Real audio, right in your browser.
10 min · 9 slides · checkpoint quiz
By the end, you will be able to:
- Explain that a sound is a vibration moving through the air.
- Tell pitch and loudness apart.
- Hear how the shape of a wave changes its character.
- Shape how a sound begins and ends.
- Build a simple synth sound and play a short tune on it.
Music technology · signals · Part 1
The Fourier transform, Part 1.
How sound becomes a spectrum. Hear why a flute and a violin playing the same note sound different, read a sound as a waveform and a spectrum, build a tone from pure sines, and find bass, mids, and treble.
15 min · 15 slides · checkpoint quiz
By the end, you will be able to:
- See the difference between a waveform and a spectrum.
- Build richer sounds by stacking pure tones.
- Read bass, mids, and treble on a spectrum.
Music technology · signals · Part 2
The Fourier transform, Part 2.
How a computer calculates that spectrum. See where samples come from, build a test wave, multiply and add sample by sample, read the DFT formula, and calculate one frequency by hand.
18 min · 12 slides · checkpoint quiz
By the end, you will be able to:
- See where digital samples come from.
- Run the frequency test: multiply sample by sample, then add.
- Interpret the main pieces of the DFT formula.
- Calculate one small frequency result by hand.
Music technology · signals · Part 3
The Fourier transform, Part 3.
Use it on your gear. Shape sound with EQ, read a headphone curve, see a spectrogram, meet noise cancelling and song recognition, then solve sound mysteries to prove you can read a sound.
15 min · 13 slides · checkpoint quiz
By the end, you will be able to:
- Shape a sound with EQ and predict the result.
- Read a headphone frequency-response curve.
- Recognize a spectrogram, and where frequency thinking shows up in everyday audio.
- Solve short sound mysteries to prove you can read a sound.
How I design learning
A few beliefs about teaching
These principles shape every lesson above, whether the learner is new to code or already works in tech.
People learn a concept by doing it first, then naming it. Every lesson here opens with something you manipulate, not a definition to memorize.
Learners arrive with real experience. I connect new ideas to the tools and mental models you already use, so it feels like a step, not a leap.
I design around what people actually get wrong, then build the moment that corrects it. Watching a wrong assumption break is the fastest way to learn.
You should know what you will be able to do, then prove it to yourself. Every lesson states its objectives up front and ends in a real, graded check.
People need to know why something matters and to move at their own pace. Lessons are self-directed, skippable, and tied to work you actually do.