Goal: I will be converting these projects into functional interactive websites! I'd even like to add ReactJS application to one or two of my sites.
https://docs.webplatform.org/wiki/tutorials/understanding-css-units
http://inamidst.com/stuff/notes/csspx
https://developer.mozilla.org/en-US/docs/Web/CSS/length
https://snook.ca/archives/html_and_css/font-size-with-rem
https://developer.mozilla.org/en-US/docs/Web/CSS/%3A%3Aafter
http://nicolasgallagher.com/micro-clearfix-hack/
https://developer.mozilla.org/en-US/docs/Web/CSS/clear
https://developer.mozilla.org/en-US/docs/Web/CSS/overflow
https://alistapart.com/article/css-positioning-101