What is the DOM in JavaScript and why is it important?

The DOM (Document Object Model) is the browser representation of your HTML as a tree of nodes. JavaScript reads and updates this tree to change content, styles, or structure without reloading the page. Most interactive UI behavior in modern web apps is a controlled way of updating the DOM.

const heading = document.querySelector('h1');
heading.textContent = 'Welcome to Talvior guides';
heading.classList.add('highlight');

Start simple: try this concept in a tiny project before moving to advanced tools.