Comprehensive JavaScript Study Plan (80-20 Rule)

Focus on the 20% of concepts that power 80% of real-world projects. Master these fundamentals first, then expand through projects.

Core Learning (2 Weeks)

Daily Structure:

Morning: Study concepts (1–2 hours).

Afternoon: Practice exer…


This content originally appeared on DEV Community and was authored by Pranav Tech

Focus on the 20% of concepts that power 80% of real-world projects. Master these fundamentals first, then expand through projects.

Core Learning (2 Weeks)

Daily Structure:

  • Morning: Study concepts (1–2 hours).
  • Afternoon: Practice exercises (1–2 hours).
  • Evening: Reflect, debug, and review (30 mins).

Week 1: Foundations

Day 1: Basics

  • Topics: Variables (let, const), data types (strings, numbers, booleans), operators (+, ===, !).
  • Resources: MDN JavaScript Basics, freeCodeCamp’s JS Syntax course.
  • Practice: Write code to calculate BMI or convert Celsius to Fahrenheit.

Day 2: Control Flow

  • Topics: Conditionals (if/else, switch), loops (for, while).
  • Resources: JavaScript.info Conditionals and Loops.
  • Practice: Solve FizzBuzz, print prime numbers.

Day 3: Functions

  • Topics: Function declarations, parameters, return, arrow functions, scope.
  • Resources: MDN Functions Guide.
  • Practice: Create a function to reverse a string or calculate factorials.

Day 4: DOM Manipulation

  • Topics: Select elements (querySelector), modify content (textContent, innerHTML), styles (classList).
  • Resources: freeCodeCamp DOM Manipulation Tutorial.
  • Practice: Build a button that changes page background color.

Day 5: Events

  • Topics: Event listeners (click, submit), event objects, preventDefault().
  • Resources: JavaScript.info Introduction to Events.
  • Practice: Create a toggle button for dark/light mode.

Day 6: Arrays

  • Topics: Array methods (push, pop, map, filter, forEach).
  • Resources: MDN Array Guide.
  • Practice: Filter even numbers from an array or sort names alphabetically.

Day 7: Review & Mini-Project

  • Review: Rebuild earlier exercises without referencing code.
  • Mini-Project: Simple counter app (increment/decrement buttons).

Week 2: Intermediate Concepts

Day 8: Objects

  • Topics: Object literals, methods, this keyword, destructuring.
  • Resources: JavaScript.info Objects Basics.
  • Practice: Create a user object with methods to update profile data.

Day 9: Asynchronous JS

  • Topics: Callbacks, promises, async/await, fetch().
  • Resources: MDN Asynchronous JavaScript.
  • Practice: Fetch data from JSONPlaceholder API and display titles.

Day 10: Error Handling

  • Topics: try/catch, throwing errors, debugging with console.
  • Resources: JavaScript.info Error Handling.
  • Practice: Add error handling to your API fetch code.

Day 11: ES6+ Features

  • Topics: Template literals, spread/rest operators, modules (import/export).
  • Resources: ES6 for Everyone (free course).
  • Practice: Refactor old code using ES6 syntax.

Day 12: Local Storage

  • Topics: localStorage, JSON.stringify(), JSON.parse().
  • Resources: MDN Web Storage API.
  • Practice: Save and retrieve user preferences (e.g., dark mode).

Day 13: Closures & Callbacks

  • Topics: Lexical scope, closure examples, higher-order functions.
  • Resources: MDN Closures.
  • Practice: Create a function factory (e.g., multiplier functions).

Day 14: Final Review & Prep for Projects

  • Review: Build a small app combining DOM, events, and localStorage.
  • Prep: Set up a project folder with HTML/CSS/JS files.

5 Projects to Apply & Expand Knowledge

Build these in order, increasing complexity and autonomy. Use documentation and Google to solve roadblocks.

1. To-Do List (Beginner)

  • Description: Add, delete, and mark tasks as complete.
  • Key Concepts:
    • DOM manipulation (rendering tasks dynamically).
    • Event handling (form submission, click events).
    • Array methods (filter for deleting tasks).
    • Local storage (persist tasks on reload).

2. Weather App (Intermediate)

  • Description: Fetch real-time weather data from an API (e.g., OpenWeatherMap).
  • Key Concepts:
    • fetch() and async/await.
    • Working with JSON data.
    • Error handling for API failures.
    • Dynamic DOM updates based on user input (city search).

3. Quiz Game (Intermediate+)

  • Description: Timed quiz with multiple-choice questions and a scoreboard.
  • Key Concepts:
    • Object-oriented design (quiz and question classes).
    • setInterval for timers.
    • State management (tracking current question, score).
    • Event delegation for answer buttons.

4. Budget Tracker (Advanced)

  • Description: Track income/expenses with charts (use Chart.js).
  • Key Concepts:
    • Complex state (transactions, balance, categories).
    • Integration with third-party libraries (Chart.js).
    • Form validation and error feedback.
    • Local storage for data persistence.

5. Full-Stack Bookstore (Advanced+)

  • Description: CRUD app with a Node.js/Express backend and vanilla JS frontend.
  • Key Concepts:
    • REST API design (GET, POST, DELETE).
    • Advanced async operations (frontend-backend communication).
    • Modular code (separate API service module).
    • Deployment basics (DigitalOcean, Netlify).

Tips for Success

  1. Code Daily: Even 30 minutes reinforces muscle memory.
  2. Break Problems Down: Use pseudocode to plan projects step-by-step.
  3. Embrace Debugging: Learn to use console.log() and Chrome DevTools.
  4. Refactor Ruthlessly: Improve code readability and efficiency after getting it working.

This plan balances structured learning with creative problem-solving. Start small, iterate often, and celebrate progress! 🚀


This content originally appeared on DEV Community and was authored by Pranav Tech


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