Practice · Learn
CodeOath
Practice real interview problems and read concept guides for HTML/CSS, JavaScript, SQL, and C#/.NET Core — the fundamentals that come up over and over in technical screens, in one place.
Blog
Textbook-depth reference articles on the box model & specificity, closures & the event loop, SQL joins & NULL handling, value vs. reference types, ACID/SOLID/design patterns, and more
Code Lab
77 practice problems — real JavaScript execution and live SQL queries against a real database, right in your browser
UI Challenges
17 HTML/CSS/JS component-building exercises with a live preview — build it, then compare against the solution