1
Unicodes can be used in HTML to render icons that act just like text, inheriting all standard text styling properties such as font size, alignment, and display blocks.
2
A media query with `screen` and `max-width` properties allows browsers to apply specific CSS rules when the viewport shrinks below a designated breakpoint (e.g., 680 pixels).
3
The CSS `:not()` pseudo-class combined with `:nth-child(1)` can be used to apply styles to all list items except the first child (the home link).
4
Best practice for responsive design dictates building and making each page section mobile-compatible incrementally before moving on to the next section, rather than attempting to fix responsiveness for the entire site at the end.