Websites and Online Courses:

1. MDN Web Docs:

   • MDN JavaScript Guide: A comprehensive guide covering all aspects of JavaScript, from basic to advanced topics.

2. freeCodeCamp:

   • JavaScript Algorithms and Data Structures Certification: Interactive coding challenges and projects to learn JavaScript fundamentals, algorithms, and data structures.

3. Codecademy:

   • JavaScript Course: A hands-on course covering JavaScript basics, including variables, control flow, functions, and more.

4. Udemy:

   • The Complete JavaScript Course 2021: From Zero to Expert!: A popular course by Jonas Schmedtmann covering modern JavaScript features, DOM manipulation, asynchronous JavaScript, and more.

5. Coursera:

   • JavaScript for Beginners: Various beginner-level JavaScript courses offered by institutions like Duke University and The Hong Kong University of Science and Technology.

Books:

1. "Eloquent JavaScript" by Marijn Haverbeke:

   • Eloquent JavaScript Website: The online version of the book is available for free and covers JavaScript basics, programming concepts, and advanced topics.

2. "You Don't Know JS" Series by Kyle Simpson:

   • You Don't Know JS Series on GitHub: A series of books diving deep into JavaScript language features, including scope and closures, this, objects, and more.

3. "JavaScript: The Good Parts" by Douglas Crockford:

   • JavaScript: The Good Parts: This book focuses on the best practices and effective parts of JavaScript for writing clean and maintainable code.

YouTube Channels:

1. Traversy Media:

   • Traversy Media YouTube Channel: Brad Traversy covers a wide range of web development topics, including JavaScript tutorials, projects, and tips.

2. The Net Ninja:

   • The Net Ninja YouTube Channel: Shaun Pelling provides clear and concise tutorials on JavaScript, modern frameworks, and libraries.

Documentation and References:

1. ECMAScript Documentation:

   • ECMAScript Documentation: Official documentation for ECMAScript (the standard JavaScript is based on) provides detailed specifications and language features.

2. Node.js Documentation:

   • Node.js Documentation: If you're interested in server-side JavaScript development, Node.js documentation is essential for learning about its APIs and features.

Practice Platforms:

1. LeetCode:

   • LeetCode: Offers coding challenges and problems, including those related to algorithms and data structures, to improve your JavaScript skills.

2. Codewars:

   • Codewars: Provides coding challenges (known as katas) where you can practice JavaScript by solving problems and challenges of varying difficulty levels.

These study materials offer a combination of tutorials, books, documentation, and practice platforms to help you learn JavaScript effectively at your own pace. Happy coding!