Close your skill gaps with resources that actually exist.

The official pytest guide to writing and running your first tests.

Create a bucket, upload objects and configure access using the official user guide.

The official Jest guide to testing JavaScript and TypeScript code.

A short video that gets you committing, branching and pushing to GitHub.

Official free lessons on collecting and analysing product and website analytics.

Hands-on labs and learning paths for Google Cloud, with a free tier of content.

The official quickstart: create a repository, branch, commit and open a pull request.

MDN’s guide to how HTTP works: requests, responses, methods, status codes and headers.

The official learning guides: what Node.js is, modules, the event loop, files and HTTP.

The W3C’s introduction to accessibility principles and why they matter.

Build and validate your first models with scikit-learn: decision trees, random forests and model validation.

Write queries against real BigQuery datasets: SELECT, WHERE, GROUP BY, ORDER BY, joins and unions.

A collection of the psychological principles designers use to build better interfaces.

A free course on building accessible web experiences: semantics, focus, color and ARIA.

A comprehensive free tutorial series on modern C++.

A free course from the Chrome team covering the box model, layout, responsive design and more.

An interactive visual game that teaches branching, merging, rebasing and remote workflows.

A complete beginner JavaScript course on YouTube.