This was an essential course for someone like me who was in the Java Spring ecosystem and suddenly found myself using React and Next.js directly. I was approaching concepts superficially and struggling without getting a grasp on various errors related to library references and builds, but it was great to learn about how the JavaScript ecosystem is structured and understand various principles by implementing them from the ground up. I think this is a perfect course to choose if you're someone who has vague anxiety while developing with JavaScript.