— free · one lesson a day · no signup

Practice prompt engineering,
on real work scenarios

Not another video course. You build the prompt step by step, picking the stronger option each time — with instant feedback and the technique behind every choice.

~3 min per lesson · techniques with real sources · daily streak
30lessons in the library
5competency tracks
11sourced techniques
Today's lesson · #38free · no signup

A property listing that doesn’t promise what isn’t there

technique: Negative constraintsMediumbuild in 6 decisions

A new lesson every day at midnight UTC. Today's is always open.

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How the practice works

1

Get a real task

An actual workplace scenario: fintech, support, data, legal. With one named technique to apply, before you build the prompt.

2

Build the prompt, decision by decision

At each step, two plausible options — you pick the stronger one. Right away, you see which one teaches the model to fail less, and why. No waiting for a score, no cost.

3

See the diff and go deeper

At the end, your prompt side by side with the reference. In the Basic tracks you write from scratch and an AI judge scores each criterion, with the commented reference answer.

The curriculum

Explore the tracks →

Five competency tracks, from clarity to guardrails. Every lesson teaches a real technique, with the source behind it.

01
Fundamentals: clarity and format
Precise instructions, output format, constraints, and persona — the base of every reliable prompt.
123455 lessons
Clear, specific instructionsStructured output formatNegative constraints+1
02
Context and examples
Few-shot, delimiters, and persona to guide the model through context.
12345677 lessons
Few-shot (examples)Delimiters / XML tagsRole prompting (persona)
03
Reasoning
Chain-of-thought and decomposition for tasks that require thinking in steps.
1234566 lessons
Chain-of-thoughtDecomposition (least-to-most)Zero-shot CoT ("think step by step")
04
Communication for the right audience
Calibrate vocabulary and tone for whoever will read it.
1234566 lessons
Audience adaptation
05
Guardrails and safety
Refuse, acknowledge, and redirect responsibly.
1234566 lessons
Safe refusal (guardrails)Negative constraints
Proof of what you learn

Finish a track, earn a verifiable credential

The only prompt engineering credential where every technique was applied to a real task and scored criterion by criterion by an AI judge — public and verifiable at a link.

Foundations Badge · free

Practice on 5 days and earn your first credential to share on LinkedIn.

Certificate of Mastery · Basic

Complete a competency track and get the certificate with the techniques you mastered and the verification №.

Watching doesn't build the skill. Practicing does.

The difference between this training and a video course:

Video course
×You watch someone prompt
×Feedback: none
×The instructor's generic example
×It ends and you forget
PromptEval Learn
✓You build the prompt
✓Instant feedback on every choice
✓A real task + a diff with the reference
✓One lesson a day keeps the habit

No made-up techniques

Every lesson teaches a documented technique with the source linked: arXiv papers and the official Anthropic and OpenAI guides.

Wei et al. 2022 (chain-of-thought)Brown et al. 2020 (few-shot)Anthropic prompt docsOpenAI prompting guideThe Prompt Report (2024)

Frequently asked questions

How do you practice prompt engineering?
The practice that works is active, not passive: instead of watching, you decide. Each PromptEval Learn lesson is a real task where you build the prompt by picking, step by step, between two options — and you see right away which one teaches the model to fail less, and why. On Basic you go deeper writing from scratch, with an AI judge that scores each criterion from 0 to 100.
Do I need to pay or create an account to practice?
Today's lesson is free and needs no signup or API key. The full competency tracks, the archive of past lessons, and the commented reference answer are on the Basic plan.
Do I need to know how to code?
No. The lessons are natural-language workplace tasks (support, data, fintech, legal). You build the prompt by choosing between options, in English or Portuguese, with no code involved.
How long does it take per day?
About 3 minutes per lesson. The goal is the habit: one technique a day, with a streak, the same way you learn a language.
Do I get a certificate?
Yes. Practice on 5 days and you earn the Foundations Badge, free. And every competency track (Basic) ends in a Certificate of Mastery: public, with the techniques you mastered and a verification №, each scored by an AI judge criterion by criterion. You can add it straight to LinkedIn.

Your first lesson takes 3 minutes

No signup, no card, nothing to install. Build the prompt and see the result.

Practice today's lesson