Udemy – JavaScript – The Complete Guide 2025 (Beginner + Advanced)

Join the most comprehensive and in-depth JavaScript course on Udemy and learn JavaScript from the ground up, in great detail with this bestselling course!

JavaScript is THE most important programming language you need to learn as a web developer – and with this course, you make sure that you will not miss a single thing you have to know as a JavaScript developer!

This is the most comprehensive and modern course you can find on JavaScript – it’s based on all my JavaScript knowledge AND teaching experience. It’s both a complete guide, starting with the core basics of the language, as well as an extensive reference of the JavaScript language and environment, ensuring that both newcomers as well as experienced JavaScript developers get a lot out of this course!

It’s a huge course packed with important knowledge and helpful content:

From the core basics, over advanced concepts and JavaScript specialties, all the way up to expert topics like performance optimization and testing – this course has it all. My goal was to create your go-to resource for the JavaScript language, which you can not just use for learning it but also as a resource you can come back to and look up important topics.

The course is based on my experience as a long-term JavaScript developer as well as a teacher with more than 2,500,000 students on Udemy as well as on my YouTube channel Academind. It’s packed with examples, demos, projects, assignments, quizzes and of course videos – all with the goal of giving you the best possible way of learning JavaScript.

What’s in the course?

This course is obviously packed with content – I therefore strongly recommend that you check out the full course curriculum to get a clear idea of all the topics covered in the course. In general, here’s what you’ll find in the course:

• Modern JavaScript from the start: The JavaScript syntax changed over time – in this course, you’ll learn the latest syntax from the start (you’ll also learn about the old one though, so that you can work in ANY JS project)

• ALL the Basics: Variables, constants, functions, how scripts are loaded etc

• Arrays & Objects: We’ll explore these very important data structures in great detail

• Control Structures: Understand how to run code conditionally and in loops

• A look behind the Scenes: How JavaScript engines work behind the scenes and what that means for us

• Deep dives into Core Concepts: ALL the special things about JavaScript function, different syntaxes

• Working with the DOM: How to manipulate web pages dynamically via JavaScript (including deep dives and different use-cases)

• Events in JavaScript: Learn how to listen to a broad variety of events (e.g. drag & drop) and execute appropriate code

• Classes & Object-oriented Programming: Learn how to work with classes, prototypes, the “this” keyword, constructor functions and much more

• Asynchronous and Synchronous Programming: We’ll explore callbacks, promises, async/ await and other important tools and language features to execute code correctly

• Http Requests: Learn how to send Http requests via JavaScript

• Tooling, Optimizations & Browser Support: Code splitting, producing small code and ensuring that scripts work in all browsers  – this matters and hence is covered in great detail

• Libraries & Frameworks: Learn about libraries like Axios or frameworks like React.js – why they matter and how to use them

• Node.js: Whilst focusing on the browser-side for the majority of the course (because the syntax is the same), we’ll also have a dedicated section on Node.js to learn all about that JS host environment

• Security & Performance Optimizations: Of course security matters, so does performance – no surprise that both is covered in the course!

• Automated Testing: Testing manually is hard work and can be unreliable – in this course you’ll also get an introduction into automated testing

What are the course prerequisites?

• NO JavaScript knowledge is required – you’ll learn it from scratch!

• You also need NO programming experience other than basic web development knowledge (e.g. how the web works)

• Basic HTML and CSS knowledge is recommended but not a must-have