1. Concept 1 – Responsive Web Design: A design approach that ensures websites adapt to different screen sizes and devices. It helps maintain usability and visual balance across desktops, tablets, and smartphones.
2. Concept 2 – CSS Flexbox: A modern layout model that allows developers to align and distribute space among items in a container, even when their size is unknown or dynamic. It’s ideal for creating responsive navigation bars and grids.
3. Concept 3 – CSS Grid: A two-dimensional layout system that enables precise arrangement of elements into rows and columns. Grid layouts make it easier to organize content consistently across a site.
4. Concept 4 – Media Queries: A core feature of CSS that applies different styles depending on screen size, resolution, or orientation. Media queries are what make websites mobile-friendly.
5. Concept 5 – Semantic HTML: The use of meaningful tags such as <header>, <section>, and <footer> to improve accessibility and SEO while giving structure to web pages.
6. Concept 6 – CSS Selectors: Patterns used to target and style specific HTML elements. Common types include class selectors (.classname), ID selectors (#id), and element selectors (h1).
7. Concept 7 – Hover Effects: A CSS technique that changes the appearance of a webpage element when the user hovers over it. This adds interactivity and enhances the user experience.