What's new
New guides, topics, and features - newest first.
August 2026
July 2026
- New Sixteen new practice lessons across Postgres, TypeScript, Math, and Physics.
- New Seven new cheat sheets: JavaScript, CSS, TypeScript, React Hooks, grep, systemctl, and nginx.
- New Build a Mini UI Framework: reactivity, a virtual DOM, and the keys bug in ~120 lines of runnable JS.
- New Angular from Zero: standalone components, signals, DI, and just enough RxJS.
- New Svelte from Zero: runes, snippets, and why there is no virtual DOM.
- New Vue from Zero: the reactivity model, and the destructuring trap that breaks it.
- New Next.js from Zero: server vs client components, and data without an API layer.
- New New Frontend category, opening with React from Zero.
- New Every guide phase now ends with four related guides.
- Improved Review now uses FSRS spaced repetition and mixes cards across guides.
- Improved Quizzes: retry just the ones you missed, with per-option explanations.
- New A quick-recall step before each quiz: recall first, then check.
- Improved The tutor now teaches from your answer and points back to the root concept.
- Improved Better keyboard and screen-reader support, with readable text in every theme.
- Improved Fonts now load from this site, not Google: faster and more private.
- Improved Broken links now land on a real page with ways back.
- New Two new CSS deep-dives: margin collapse, and when a flex item will not shrink.
- New Practice: HTML and CSS with a live preview, twelve lessons.
- New Practice: twelve advanced Python and JavaScript bug-hunt lessons.
- New Practice: six advanced SQL lessons for queries that run clean but are wrong.
- Improved Practice: a SQL query matching no rows now shows an empty table.
- New Decision scenarios: work a live outage or a 3am page and see what each choice costs.
- Improved Build-along projects now let you write the key function and check it.
- New Practice: fix-the-bug lessons across Python, JS, TS, SQL, Postgres, git, and regex.
- Improved Practice: the sidebar now shows just the module you picked.
- Improved Diagrams now render instantly with no JavaScript, matching your theme.
- New C and C++ from zero: two deep from-scratch courses.
- New Power BI from zero, plus a DAX deep dive.
- New Empty searches can now add the topic to the writing queue.
- Improved A changelog shortcut in the header, and a recently-added strip on the home page.
- New Every guide page now links to the GitHub editor for that file.
- New Practice: hands-on SQL, JavaScript, and Python in a three-panel playground.
- Improved Practice: each module now has its own overview page and lesson sidebar.
- New Highlight any passage in a guide and add a private note.
- Improved The lofi player is much better on mobile, with a full player sheet.
- Improved Word Search now has 22 topic packs plus a general mix.
- New A public backlog: vote on what we write next.
- New Optional review reminders and a practice streak.
- New New Working as a Developer category: code review, legacy code, on-call, and interviews.
- New Advanced capstone guides across Logic, Physics, Security, No-Code, and more.
- New Front-door guides for the Tools and Frameworks shelves.
- New Web Fundamentals: ten new guides on HTML, CSS, the DOM, forms, and more.
- New Download any guide as an EPUB.
- New The AI tutor now shows its sources and answers why on wrong quiz answers.
- New A live-radio mode for the lofi player.
- New Read offline: pages you have visited stay readable.
- New Translate any page into 8 languages from the header.
- New Request a guide: tell us what you wish existed.
- New Eleven more cheat sheets: sed, awk, ffmpeg, terraform, and psql.
- New Three bigger build-along projects: a blog generator, a Go CLI, and a key-value database.
- New High-contrast dark theme.
- New Cheat sheets now appear in search and the command palette.
- New Built for AI assistants: sitemap, structured data, and a machine-readable server.
- New AI tutor: ask about the phase you are reading, right from the guide.
- New Animated click-through explainers for core concepts.
- New A first-visit question sets beginner-friendly defaults.
- Improved Listen and feedback now sit inside the reader.
- Improved Faster page loads on mobile.
June 2026
- New Five new themes and a font picker.
- New Brain games to sharpen the fundamentals.
- New Guides on no-code and low-code tools, and working with AI.
- New Math, Physics, and Logic topics.
- Improved The lofi player moved into the header with clearer controls.
May 2026
- New In-depth language guides, including Java and C#.
- New A Frameworks learning path.
- New Cheat sheets and a plain-language glossary.