Front-End Basics.

Semantic HTML Foundation: Moving beyond <div> soup to use meaningful tags like <header>, <nav>, and <main>, ensuring your markup is accessible to screen readers and optimized for SEO from day one.

Mastering the Box Model: Understanding the core mechanics of layout—Content, Padding, Border, and Margin—is non-negotiable. If you don't know how these interact, you will never truly control your CSS.

Separation of Concerns: Rigidly adhering to the "Holy Trinity" of web standards: HTML for structure, CSS for presentation, and JavaScript for behavior. Inline styles and script tags are the enemies of maintainability.

Responsive from the Start: Treating mobile support not as a "feature" to add later, but as a fundamental requirement. Using fluid grids and media queries to ensure your content is accessible on any device, right out of the box.