Inspect is a web professional’s secret weapon. Developers, designers, and marketers frequently use it to peek inside any website (including their own) in order to preview content and style changes, fix bugs, or to learn how a particular website is built. For instance, if you find an intriguing interface on a competing website, inspect element lets you see the HTML and CSS that make it up.
You can also think of your browser’s inspect feature as a “sandbox” of sorts: Play around with a web page as much as you want — change content, colors, fonts, layouts, etc. When finished, just refresh the page to revert everything back to normal. Inspect doesn’t change the website itself — only how it appears in your own browser — so feel free to experiment!