JavaScript and TypeScript

JavaScript is unavoidable if you build for the web: it runs in the browser, on the server with Node.js and inside many of the tools we use every day. At TintoDev we write almost everything in TypeScript, both the Angular frontend and the Node.js services, because on projects that pass through several hands, types catch errors that would otherwise show up in production. This selection follows that order: first the actual language, with its async model, its object model and the DOM, then TypeScript as the tool that keeps code standing as it grows. We favour courses that build complete projects and keep up with modern JavaScript, and we skip the ones still teaching var and nested callbacks as the normal way to write code. There are Spanish-language courses for the fundamentals and English reference courses for the more advanced topics.

Who it is for

• People starting in web development who want to understand the language before choosing a framework.
• People who copy JavaScript that works but could not explain why it works.
• Developers whose JavaScript projects have grown and now need TypeScript.
• Backend developers who want to use Node.js with the same language as the frontend.

What you will learn

• The modern language: let and const, modules, destructuring, classes and closures.
• Async code for real: the event loop, promises, async/await and why several awaits in a row can make a screen slow.
• DOM manipulation and events, which is what frameworks do for you and is worth understanding.
• TypeScript: types, interfaces, generics and strict configuration from the start.
• Node.js basics for scripts and APIs, with the same language as the browser.

Recommended order

1. Modern JavaScript with exercises in the browser, no framework. Everything else rests on it.
2. Async code and consuming APIs. It is where most people get stuck, and it deserves its own time.
3. TypeScript as soon as you have a project with more than a handful of files.
4. Then a framework (Angular or React) or Node.js on the backend, depending on where you want to work.

The Complete JavaScript Course 2026: From Beginner to Pro

This English-language JavaScript course stands out for covering topics many beginner courses skip, such as the event loop, error handling and how the language engine works. We would recommend it to people comfortable with technical English who want to understand why the language behaves the way it does, not just how to write it.

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Desarrollo Web con HTML, CSS y JavaScript desde Cero

This is a good starting point for anyone who has never built a web page and wants to cover HTML, CSS and JavaScript in one course, in Spanish, with a final project that ties it all together. We would recommend it for its logical order: structure first, then styling, then interactivity, which is how frontend is best learned.

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Javascript desde cero: De principiante a experto

This is a solid pick for anyone who wants to learn JavaScript in Spanish with a syllabus that goes beyond syntax into asynchronous code, browser APIs and object-oriented programming. We would recommend it to people who have already decided on frontend work and want one course that organizes the fundamentals before moving to a framework.

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Frequently asked questions

How long does it take to learn JavaScript?

The fundamentals settle in two or three months of daily practice. Mastering async code and writing code someone else can maintain takes longer, and it comes mostly from building projects, not from stacking up courses.

Should I learn JavaScript or TypeScript first?

JavaScript first. TypeScript is JavaScript with types on top, and its errors only make sense if you know the language underneath. Move to TypeScript once you write JavaScript comfortably, ideally on your first project that grows beyond a few files.

Is JavaScript useful for getting a job in Latin America?

Yes, it is one of the most requested languages for web development in the region, both at local companies and in remote work. Many openings ask for TypeScript on top of JavaScript, so it pays to arrive with both.

Do I need to learn a framework after JavaScript?

For frontend work, almost always: most projects use Angular, React or Vue. A framework is learned much faster once the language is solid, and switching from one to another stops being a problem.

Are there JavaScript courses in Spanish?

Yes. The catalogue mixes Spanish and English courses, and each listing shows the course language. There is good Spanish material for the fundamentals; for advanced TypeScript and architecture, the reference courses are usually in English.