Understand it.
Try it.
Build it.

A hundred small lessons in making websites and apps work better. Clear explanations, a concrete example, a working pattern to try, and a prompt you can actually use.

Start with an app lesson

PLAIN ENGLISHORIGINAL INTERACTIVE SPECIMENSSOURCES + THEIR LIMITS

01 / LEARN BY DOING

One real problem.
A better way through.

These are 100 worked lessons using 15 reusable interaction models. They are not 100 finished products, native app builds, or proof of store approval.

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WHERE IT BELONGS

A CONCRETE EXAMPLE

When this goes wrong

The question to test

How to build it

Skills you will use

Native app reality check

Your product and constraints Optional. Used locally to personalize the prompt.

Prompt type

The prompt is generated from this lesson, not by a remote AI. Review it against your actual project. Do not treat an agent’s self-score as proof.

Research and its limits

Sources inform the principle; the worked example and implementation order are our design synthesis. A case report is not a universal finding. Publisher content is linked, not republished.

I tried this lesson

02 / THE READING ROOM

Evidence has
different weights.

Papers, platform guidance, books and first-person case studies are labeled separately. There is no claim to have reviewed every publication, Reddit thread or design system.

Start with foundations.

Don Norman on discoverability and feedback. Steve Krug on understandable interfaces. Gould and Lewis on testing with users and iterating from evidence.

Norman’s book overview ↗Krug’s book overview ↗

Use community stories carefully.

The collection includes an author’s Medium accessibility case study and a creator’s Reddit Developer Platform notes. They suggest questions to test, not population statistics. General Reddit discussion retrieval was inconclusive.

Browse credited open-source references ↗Explore the broader concept field guide ↗

Take the lessons with you.

Download all 100 complete prompts, with their explanations and references, as one portable Markdown file. No account or API key required.

Help keep the library open ↗