1. The document discusses responsive web design (RWD) and how it can be implemented simply using media queries.
2. It notes that RWD only requires learning one line of code - media queries like @media screen and (min-width:1025px) { /* your CSS here */ }
3. However, it also cautions that RWD requires more than just technical implementation - it involves designing for different screen sizes and a focus on user experience across devices.