I’m still in the Applied Accessibility set working my way through to the web design projects, but I have a more general question. For anyone who has completed all the Web Design Projects - how did you retain all of the lesson materials that came before to use in those projects? I mean there is 180+ lessons with no real “on your own” coding before you start those projects. I’m a little concerned by the time I get there, I will have forgotten most of them without having any other practice 
…?
Cheers
you can return to the lessons, you can play with the code till you think you understand the lesson, and whatever else is used there. You can find html/css documentation you can use as reference (example, MDN).
You certainly don’t have to memorise everything.
It is ok to forget . For example, there are more than 100 html tags but we are learning only few of them. Everyone who develops software are going to refer to a knowledgebase. The more you develop the more you are going to remember. No programmer knows everything. For example, the inventor of C++ language doesn’t know all of it. W3C is a good reference for html and css. Keep on coding !