<big>

tag makes text inside it a little bit bigger

<br>

and

<hr>

tags are called single tags or empty elements

Default title will be the name of the html page if it's untitled (meaning if the title is not provided)

control how a webpage is displayed on different devices by adjusting the width and initial zoom level of the viewport to match the device's screen size

<meta name="viewport" content="width=device-width, initial-scale=1">

width=device-width

- sets the width of the viewport to be equal to the width of the device's screen. This ensures that the webpage adapts and fills the entire width of the device, regardless of its specific screen size or resolution.

CSS media query

works properly with any device by setting device width to viewport

initial-scale=1

- sets the initial zoom level when the webpage is first loaded. A value of 1 means that the webpage will be displayed at a 1:1 ratio, without any zooming or scaling applied