Zero to JavaScript Certified: A 30-Day Study Plan

Most JavaScript study plans fail for one of two reasons: they're too vague or they assume you have four hours a day. This one is different.

This plan is built around one focused hour per day. Follow it and you'll have the JavaScript fundamentals needed to pass a certification at the end of 30 days.

Before You Start

You don't need to install anything for JavaScript Guild — code runs directly in your browser. Have a text editor, a browser with DevTools open, and a notebook ready.

Week 1: The Language Itself (Days 1–7)

Day 1 — What is JavaScript? How JavaScript runs in the browser and on servers. Write your first Hello World.

Day 2 — Variables and Types Learn let, const, and var. Understand the primitive types.

Day 3 — Operators and Expressions Arithmetic, comparison, logical operators. The difference between == and ===.

Day 4 — Control Flow if/else, switch, ternary operator.

Day 5 — Functions (Part 1) Function declarations, parameters, return values, default parameters.

Day 6 — Functions (Part 2) Arrow functions, implicit returns.

Day 7 — Review and Challenge Write a simple calculator that takes two numbers and an operator.

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Week 2: Arrays, Objects, and Daily Tools (Days 8–14)

Day 8 — Arrays Creating arrays, accessing elements, push/pop/shift/splice.

Day 9 — Array Methods map, filter, reduce. Don't move on until you can use all three from memory.

Day 10 — Objects Object literals, property access, methods.

Day 11 — Destructuring Array and object destructuring.

Day 12 — Spread, Rest, and Template Literals

Day 13 — Loops for, for...of, for...in, while.

Day 14 — Project Build a contact list app: array of objects, functions to add/remove/search.

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Week 3: Scope, Closures, and Async (Days 15–21)

Day 15 — Scope Global, function, and block scope.

Day 16 — Closures What they are, how they work, why they matter. Spend time here — closures come up in every JavaScript interview.

Day 17 — Higher-Order Functions Passing and returning functions.

Day 18 — The Event Loop The call stack, Web APIs, callback queue, microtask queue.

Day 19 — Promises Creating promises, .then(), .catch(), Promise.all.

Day 20 — async/await Converting promise chains. Error handling with try/catch.

Day 21 — Challenge Write an async function that fetches data from a public API and handles errors gracefully.

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Week 4: Classes, Modules, and Finishing Strong (Days 22–30)

Day 22 — Prototypes The prototype chain. How property lookup works.

Day 23 — Classes Class syntax, constructors, extends, super, static methods.

Day 24 — ES Modules Named exports, default exports, import syntax.

Day 25 — Error Handling try/catch/finally. Custom error classes.

Day 26 — Generators What generators are, practical uses.

Day 27 — Performance What causes slowdowns. Common anti-patterns.

Day 28 — Mock Practice Write one code example for each of the 22 topics from memory.

Day 29 — Fill the Gaps Review anything you couldn't do from memory on day 28.

Day 30 — Earn Your Certificate Complete the JavaScript Guild certification course, work through the challenges, earn your certificate.

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Tips for Staying on Track

• Block the hour. Treat it like a meeting. Same time every day.
• Use a paper notebook. Writing by hand significantly improves retention.
• Measure active recall. Before reviewing notes, write down everything you can remember first.

Thirty days is enough to go from zero to certified if you work with focus.