Courses
Structured engineering courses built around active practice, mental models and deep fundamentals. Every lesson is free to read.
SQL for Beginners
Most people learn SQL by memorising syntax. This course teaches you how to think in SQL and that is the difference between copying queries and writing them.
JavaScript for Beginners
Learn JavaScript from the first line of code. Variables, types, operators, decisions, loops, functions, strings, arrays and objects, each one explained before it is used.
System Design Foundations
Master system design through bite-sized lessons built for early-career engineers. Build scalable, bulletproof systems with hands-on projects and real-world case studies that make complex concepts click.
Machine Learning Foundations
How machines learn from data, from your first mean calculation through regression models and decision trees, and how to tell whether the model you built actually works.
Intermediate JavaScript
Execution contexts, hoisting, scope chains, closures and the event loop. How JavaScript actually runs your code, and why the quirks stop being quirks once you can see the mechanism.
Advanced JavaScript
The object model, this and binding, classes, the microtask queue, generators, modules and the patterns interviews actually ask about.