TL;DR: The Complete Front-End Web Development course is on sale for £11.43 as of August 2, saving you 92% on list price.
Interactive buttons. Scannable layouts. Flashy graphics. Beautiful typography. Elements of a website — or any digital product for that matter — that make you go "ooh" and "aah" are all thanks to the front-end developer.
The geniuses responsible for the look and visual aesthetic of a site, front-end developers make sure that it's pretty enough that people spend more than 30 seconds browsing it. It's not surprising that they get paid handsomely, too.