Many, many, many websites

I started making website in grade school, and learned a few things over the 25 or years since... from IE5.5 and HTML 4.0 through to Flash (remember ActionScript 1, and Macromedia?) and more recently React.

This is by no means a complete list, more of trip through memory lane, highlighting a few websites along the way.

Front-end: React... jQuery... JavaScript, CSS and SASS
Back-end: Node.js... PHP
E-commerce: Shopify, OpenCart
CMS: Ghost, Square, WordPress, Drupal...
E-mails: SendGrid... fighting Outlook Express.

400 Dowd

Repsonsive website before responsive was a thing: I had to bind a resize listner to the window to proportionally resize all the elements (including things like the interactive tours). I hacked my way through it by assigning everything an em value and adjusting the base typography size on refresh. Let me tell you, breakpoints in CSS make it a lot easier!
Built a unit navigation module (jQuery animations were hot at the time). I had to make it work on touchscreens too, FastClick.js anyone?)
Stiched air baloon photography into continous 360 view