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JavaScript Tutorial — Learn JavaScript Step by Step (2026, Free) - Tutorsbot

JavaScript Tutorial

68 articles · 14 chapters

What Is JavaScript and Where Does It Actually Run
Adding JavaScript to a Web Page: Three Real Ways
Your First Script and console.log
Using Browser DevTools While Writing JavaScript
Comments and Basic Code Hygiene

let, const and var Explained Without Myths
Numbers in JavaScript: Integers, Floats, BigInt
Strings and Quote Styles
Booleans, null and Missing Values Explained
Checking Types with typeof

Arithmetic and Assignment Operators
== vs ===: Choosing Comparison Correctly
The Ternary Operator and Short-Circuiting
if/else and switch: Decisions in JavaScript
Loops: for, while and Their Modern Patterns

Declaring and Calling Functions
Parameters and Return Values
Arrow Functions vs Regular Functions
Default Parameters, Rest and Function Tricks
Scope and a First Look at Closures

Arrays: A Practical Crash Course
Changing Arrays: push, pop, splice and More
forEach vs map vs for-of: Picking Loop Style
filter, find and reduce: The Search-and-Aggregate Trio
Sorting and Copying Arrays Without Surprises

Objects: Properties, Access and Mutability
Adding, Updating and Removing Object Keys
Object References vs a Real Copy
Object.keys, entries and Iteration Patterns
JSON.parse and JSON.stringify in Real Work

The String Methods That Actually Matter
Template Literals in Real Code
Splitting, Joining and Parsing Text
Searching and Replacing in Strings
Cleaning User Input: Trim, Case and Validation Basics

Destructuring Objects and Arrays
The Spread Operator in Every Place It Works
Optional Chaining and Nullish Coalescing
When Modern Syntax Reads Worse Than Plain Code

Selecting DOM Elements: querySelector and Friends
Changing Text, Attributes and Classes Safely
Creating, Inserting and Removing Elements
addEventListener and Events Decoded
Event Delegation: One Listener for Many Elements

Reading and Validating Form Data
Updating Lists of Content Without Rewriting Everything
Holding State in Plain JavaScript Apps
Render Functions: From Data to Markup
DOM Practices That Help Accessibility

Classes and Prototypes: What JavaScript Really Does
Constructors and Instance State
Getters, Setters and Method Definitions
this Binding and How to Stop Fighting It
Inheritance with extends and super

import and export: ES Modules in the Browser
localStorage and sessionStorage Done Right
fetch() and HTTP Requests Without Libraries
Consuming JSON APIs and Their Error Shapes
debounce and throttle for Real UIs

The Event Loop Explained with Real Timings
Promises: Basics and Chaining
async/await: Sequential vs Parallel Waiting
Handling Rejections and try/catch With await
Fetching Data in Sequence and in Batch

Error-Handling Strategies for Larger Scripts
Organizing a Script Without a Framework
A First Taste of Testing JavaScript
Capstone: A Persistent To-Do App in Plain JavaScript

Interview Questions

Home/Tutorials/JavaScript Tutorial

JavaScript Tutorial

Learn JavaScript from scratch in this free 2026 tutorial — from variables and functions through the DOM, modules, fetch and async/await. Every example runs in Node or the browser.

14 modules68 lessons~9 hrs of reading100% Free

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Course outline

1.JavaScript Basics for Beginners5 lessons
2.JavaScript Variables and Data Types5 lessons
3.JavaScript Operators and Control Flow5 lessons
4.JavaScript Functions5 lessons
5.JavaScript Array Methods5 lessons
6.JavaScript Objects5 lessons

7.JavaScript Strings5 lessons

8.ES6 Features and Modern Syntax4 lessons

9.JavaScript DOM Manipulation5 lessons

10.Vanilla JavaScript Projects5 lessons

11.JavaScript Classes and Prototypes5 lessons

12.JavaScript Modules, localStorage and Fetch API5 lessons

13.Async JavaScript5 lessons

14.JavaScript Error Handling and a Capstone Project4 lessons

1.JavaScript Basics for Beginners

1.1What Is JavaScript and Where Does It Actually Run
1.2Adding JavaScript to a Web Page: Three Real Ways
1.3Your First Script and console.log
1.4Using Browser DevTools While Writing JavaScript
1.5Comments and Basic Code Hygiene

2.JavaScript Variables and Data Types

2.1let, const and var Explained Without Myths
2.2Numbers in JavaScript: Integers, Floats, BigInt
2.3Strings and Quote Styles
2.4Booleans, null and Missing Values Explained
2.5Checking Types with typeof

3.JavaScript Operators and Control Flow

3.1Arithmetic and Assignment Operators
3.2== vs ===: Choosing Comparison Correctly
3.3The Ternary Operator and Short-Circuiting
3.4if/else and switch: Decisions in JavaScript
3.5Loops: for, while and Their Modern Patterns

4.JavaScript Functions

4.1Declaring and Calling Functions
4.2Parameters and Return Values
4.3Arrow Functions vs Regular Functions
4.4Default Parameters, Rest and Function Tricks
4.5Scope and a First Look at Closures

5.JavaScript Array Methods

5.1Arrays: A Practical Crash Course
5.2Changing Arrays: push, pop, splice and More
5.3forEach vs map vs for-of: Picking Loop Style
5.4filter, find and reduce: The Search-and-Aggregate Trio
5.5Sorting and Copying Arrays Without Surprises

6.JavaScript Objects

6.1Objects: Properties, Access and Mutability
6.2Adding, Updating and Removing Object Keys
6.3Object References vs a Real Copy
6.4Object.keys, entries and Iteration Patterns
6.5JSON.parse and JSON.stringify in Real Work

7.JavaScript Strings

7.1The String Methods That Actually Matter
7.2Template Literals in Real Code
7.3Splitting, Joining and Parsing Text
7.4Searching and Replacing in Strings
7.5Cleaning User Input: Trim, Case and Validation Basics

8.ES6 Features and Modern Syntax

8.1Destructuring Objects and Arrays
8.2The Spread Operator in Every Place It Works
8.3Optional Chaining and Nullish Coalescing
8.4When Modern Syntax Reads Worse Than Plain Code

9.JavaScript DOM Manipulation

9.1Selecting DOM Elements: querySelector and Friends
9.2Changing Text, Attributes and Classes Safely
9.3Creating, Inserting and Removing Elements
9.4addEventListener and Events Decoded
9.5Event Delegation: One Listener for Many Elements

10.Vanilla JavaScript Projects

10.1Reading and Validating Form Data
10.2Updating Lists of Content Without Rewriting Everything
10.3Holding State in Plain JavaScript Apps
10.4Render Functions: From Data to Markup
10.5DOM Practices That Help Accessibility

11.JavaScript Classes and Prototypes

11.1Classes and Prototypes: What JavaScript Really Does
11.2Constructors and Instance State
11.3Getters, Setters and Method Definitions
11.4this Binding and How to Stop Fighting It
11.5Inheritance with extends and super

12.JavaScript Modules, localStorage and Fetch API

12.1import and export: ES Modules in the Browser
12.2localStorage and sessionStorage Done Right
12.3fetch() and HTTP Requests Without Libraries
12.4Consuming JSON APIs and Their Error Shapes
12.5debounce and throttle for Real UIs

13.Async JavaScript

13.1The Event Loop Explained with Real Timings
13.2Promises: Basics and Chaining
13.3async/await: Sequential vs Parallel Waiting
13.4Handling Rejections and try/catch With await
13.5Fetching Data in Sequence and in Batch

14.JavaScript Error Handling and a Capstone Project

14.1Error-Handling Strategies for Larger Scripts
14.2Organizing a Script Without a Framework
14.3A First Taste of Testing JavaScript
14.4Capstone: A Persistent To-Do App in Plain JavaScript

Start with lesson 1.1

What Is JavaScript and Where Does It Actually Run