JavaScript Algorithms and Data Structures

What you'll learn

This is freeCodeCamp's foundational JavaScript course, and it earns its popularity honestly: instead of just teaching syntax, it drills algorithms and data structures — the stuff that actually shows up in technical interviews and in code that needs to scale. Arrays, objects, recursion, and problem-solving patterns are the backbone here, not framework trivia.

Why grab it

A huge share of self-taught developers cut their teeth on exactly this course, and for good reason: it's free, it comes with a real certification, and it doesn't skip the boring fundamentals that make everything after — React, Node, whatever comes next — click faster.

Who it's for: true beginners to JavaScript, or developers who learned by copying tutorials and now need to actually understand what the language is doing under the hood.