The goal is to accurately understand the core theories that form the basis of JavaScript.

The web development landscape is rapidly evolving, and it's no exaggeration to say that JavaScript is at its core. Even in the era of ECMAScript 2015, the core principles of JavaScript, prevalent in ES5, remain relevant and crucial.
"Core JavaScript" aims to provide a thorough understanding of the core theories that form the foundation of JavaScript.
Among the basic theories, it mainly covers core concepts that are important even in ES6, and aims to understand the principles rather than techniques or tips.