CLEAR · DEEP · SHAREABLE
Notes that actually stick.
Every chapter, three ways: a deep read when you have an hour, a quick revision before the interview, and a flow diagram for the moments you just need to recall.
Continue where you left off
All Courses
6 deep dives planned — 3 live, 3 coming soon
Course catalog
- 40 Chapters
Data Structures & Algorithms
Pattern-first DSA preparation for FAANG interviews. Each topic — Heaps, Intervals, and more to come — is a chapter containing a theory primer plus pattern groups, with dual-language solutions and edge-case checklists for every problem.
- 16 Chapters
JavaScript
The language that runs the web — deep notes on how JavaScript actually executes, from the Execution Context through closures, promises, and the event loop.
- 11 Chapters
Node.js
Server-side JavaScript from V8 internals up through production patterns. Designed for engineers who already know JavaScript and want the depth that interviews and incidents demand.
- Coming soon
Next.js
The React framework for production — routing, rendering strategies, caching, and deployment.
- Coming soon
React.js
Component model, hooks, rendering internals, and the state-management patterns that hold up in real apps.
- Coming soon
TypeScript
The type system explained the way you wish someone had explained it the first time — generics, narrowing, and all.
Featured Chapters
Editor's picks, across courses
Node.js · Chapter 6
libuv & Async I/O
How Node.js handles thousands of concurrent operations without a second thread — V8, libuv, the call stack, and the event loop working in harmony.
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JavaScript
Execution Context
The foundation of how JavaScript works under the hood — memory and code components, the two-phase model, and the sealed container every JS program runs inside.
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Node.js
JavaScript on the Server
How JavaScript escaped the browser, what a server really is, and the V8 engine that turns your code into lightning-fast machine instructions.
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JavaScript
Hoisting in JavaScript
Why you can use variables and functions before declaring them — and why it sometimes breaks. Full walkthrough of var, function declarations, function expressions, arrow functions, let/const, and classes.