Firebase is an online, free service provided by Google which acts as a very feature-rich, fully-fledged back-end to both mobile and web applications.Frontend Developers can use Firebase to store and retrieve data to and from a NoSQL database called Firestore, as well as to authenticate their app's users with the Firebase Auth service.

While Firestore, the Realtime Database is really just one big JSON object that the developers can manage in realtime. It allows you to set up the data you want for your application, while Firebase Authentication is built by the same people who created Google Sign-in, Smart Lock, and Chrome Password Manager.Firebase also provides a service called Firebase Cloud Functions which allows you to run server-side JavaScript code in a Node.js environment, and you can also deploy all of your applications to Firebase hosting.

Firebase provides a ready-made backend system that frontend developer can use to hook their GUI without waiting for the backend to be ready.

Firebase provides database, authentication, payment, and API which are an integral part of any frontend application, and with that is made readily available, your development time is significantly reduced.

Though a good knowledge of Firebase services helps here and if you are starting from scratch then the Firebase Fundamentals course by Joe Eames on Pluralsight is a great resource for beginners.

People might argue that using Firebase means you are locked into Google Cloud Platform and you may not be able to deploy your web application or mobile app into AWS, Azure, GCP, or any other Cloud platform, but that's not true.As long as you follow standard coding practice and separation of concern you can encapsulate interaction in the service or data layer.

In most cases, developers use Firebase on the development stage with an actual backend on production. So they design their app in such a way that switching to a different backend is easier, this approach results in a better structure.

Firebase not only provides blazing-fast data storage capabilities but also a simple API, which can be tempting if you are considering to use Firebase in Production.That's all about why frontend developers should learn Firebase in 2022. These were just some of the most important reasons I can think of now, but there are many more. Firebase is evolving and adding more and more services so that more and more companies start using them in Production as well.

If you are learning Angular, React.js, or Vue.js then Firebase can really help you with developing projects and mastering the front-end framework of your choice.