Master the web's first language from zero to pro.
Before your first line, know where JavaScript runs and how to run it.
Variables are the boxes that store your data — the basis of any program.
Every value has a type — understanding it prevents many bugs early.
Operators let you calculate, compare, and build the logic that drives a program.
What lets a program make decisions and repeat tasks instead of running in a straight line.
Functions wrap logic into reusable blocks — the heart of clean code.
The two most important data structures — most real data lives in them.
Grasping scope and closures separates juniors from real pros.
The DOM is the bridge between your code and what the user sees.
Events make your page react to the user: clicks, typing, scrolling.
Modern code is written in ES6+ — you must read and write it fluently.
JSON is the universal language for exchanging data between apps and servers.
Most real operations take time — handle them without freezing the page.
Most apps pull their data from external servers via APIs.
Robust code anticipates errors and handles them instead of crashing.
Understanding this and prototype inheritance reveals how objects really work.
Splitting code into modules keeps it organized, reusable, and maintainable.
Mastering tooling lets you write, test, and ship professional code efficiently.