In recent years, web programming has become increasingly relevant, with javascript emerging as one of the most widely used and powerful programming languages for developing interactive web applications. With javascript, you can create dynamic Web sites, add interactivity to page elements, handle asynchronous calls to servers, and even create engaging games. This guide is designed for those who want to enter the world of web programming with a practical and effective approach. Whether you are a complete beginner or already have some basic knowledge of HTML and CSS, this manual has been structured to walk you step by step through the process of learning javascript. With this guide, you will be able to gain a solid understanding of the fundamentals of javascript and develop the skills you need to create interactive Web applications. We will start with basic concepts such as variables, operators, and control structures, and then delve into topics such as functions, arrays, objects, and DOM manipulation. We will also learn how to handle errors, work with APIs for sending and receiving data, and implement asynchronous programming.