Learn AI by proving it

A skill tree for AI, where every branch is earned.

Free lessons and quizzes you work through at your own pace, then short modules that each end with a task on your own work. A person grades it. Pass the trunk and earn a badge an employer can verify.

Start learning freeStart the trunk

How it works

  1. Learn

    Short lessons on a skill tree. Free, no account needed. A quick quiz checks your understanding.

  2. Practise

    Quizzes and spaced review count toward your skill progress. They are practice, not a credential.

  3. Prove

    Each trunk module ends with a task on your own material, so the result only makes sense as yours.

  4. Earn

    A person grades it pass or not yet, with one sentence of feedback. Retries are free. Pass the trunk for a verifiable badge.

Free lessons

Pick a subject, start at the root of its skill tree, and work outward. No streaks, deadlines or reminders.

  • AI Foundations

    A plain-language tour of what AI tools are, how to get good results from them, and how to use them without getting burned.

    32 skills in 5 branches: How models work · Prompting well · Using AI safely and effectively · AI for work · Building with AI

    Skills mastered0 of 32 (0%)
    Open the skill tree: AI Foundations

  • Learning How to Learn

    Evidence-based habits that make studying anything faster, easier, and more likely to stick.

    15 skills in 3 branches: How memory works · Focus and motivation · Study strategies

    Skills mastered0 of 15 (0%)
    Open the skill tree: Learning How to Learn

The trunk

Four human-graded modules everyone completes before branching. This is the route to a verifiable badge.

  1. 1. What you are actually talking toF1 · F2 · F3 · F6 · ~35 min
  2. 2. Sharing safelyF5 · F4 · ~25 min
  3. 3. Writing a prompt that worksP1 · P2 · ~30 min
  4. 4. Deciding what to trustV1 · V3 · ~30 min

Two branches at launch

Knowledge worker

You write, analyze, plan, or manage. You'll use AI through chat and document tools and need to know what to trust.

Branch modules coming after the pilot

Builder

You'll wire AI into a tool, script, or workflow. You need APIs, evaluation, and cost, on top of the fundamentals.

Branch modules coming after the pilot

The skills a badge certifies

Green markers are trunk skills. Each skill is a thing you can do, and each badge lists exactly which ones it certifies.

Trunk (everyone)Branch skills
FoundationsPromptingVerificationToolsCommunicationFoundations — Explain in plain words what a language model does (predicts text from context) and name two things it is NOT (a database, a search engine).
F1Foundations — Describe what can and cannot be shared with an AI tool (personal, confidential, credentials) and apply it to a real scenario.
F5Foundations — Identify a hallucination in a model response and explain why it happened.
F2Foundations — Explain what context is, what fits in it, and why the model "forgets".
F3Foundations — Say in plain words what a typical AI conversation costs and why experimenting is expected, not wasteful.
F6Foundations — Recognize which tasks a model is good at, bad at, and unsafe for, given a list of real tasks.
F4Prompting — Write a prompt with role, context, constraints, and an output format, and show the result improves over a bare question.
P1Prompting — Iterate on a prompt: diagnose a bad output, change one thing, and explain what the change fixed.
P2Prompting — Provide examples in a prompt (few-shot) to steer format or tone.
P3Prompting — Break a task the model fails at into steps it can do, and chain them.
P4Verification & judgment — Check a model's factual claims against a source and mark which held up.
V1Verification & judgment — Write a short rubric for a task and use it to compare two model outputs.
V2Verification & judgment — Decide when to trust, verify, or reject a model output based on stakes and reversibility.
V3Tools & workflow — Pick an appropriate tool for a task (chat, document upload, code assistant, image) and justify the choice.
T1Tools & workflow — Use a model on their own material (a document, a dataset, notes) and produce a usable result.
T2Tools & workflow — Turn a repeated manual task into a reusable prompt or template.
T3Tools & workflow — Choose a model tier for a task, weighing cost, speed, and quality.
T4Communication — Explain to a non-technical person what they did with AI and what they checked.
C1Communication — Document a prompt or workflow so someone else can reuse it.
C2