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Learn how things work

Short paths to understand each concept. Your progress is stored only in this browser.

5 steps

Understand web authentication

From how data travels as text (Base64, URLs) to what a JWT really contains.

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Data formats and APIs

Read and shape JSON, YAML or XML, and see how an API is described with OpenAPI.

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Everyday debugging

Dates, identifiers and text patterns: what shows up in every log or bug.

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Securing your website

HTTPS certificates and security headers: what the browser checks before trusting your site.

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Visual CSS for your site

Color, contrast, gradients, shadows and buttons: just enough for an interface to look good and read well.

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