The part of the lecture that I found most interesting was the section on the Foundation Languages which are HTML, CSS3 and JavaScript. This resonated with me because I wasn't too familiar with these terms and they seemed interesting when thinking about how websites really work. Here is what I gathered from the lecture on these 3 languages
HTML5
HTML5 is basically an extension of HTML that allows you to do much more than you were able to do with HTML. Before HTML5 it was hard to add media so people would use external sources to play media, this now eliminates the need for outside sources. HTML5 can be used to write offline web applications, and to relay location information to websites as well. HTML5 basically provides the structure for the site.
CSS3
CSS3 is used along side HTML to provide the site with Style. When we say style we mean things like being able to add colors, fonts, and images to the site. This is basically dictates what the site will look like as far as construction and visual presentation.
JAVASCRIPT
Javascript is basically what makes the site go, the logic for the site. What JavaScript does is it allows Web Developers to make there sites interactive and usable. For example without JavaScript it wouldn't be possible to create a button on a site and have it redirect you elsewhere as it's supposed to.