List of Up-to-now functions

I’ve looked for this but didn’t really find it.
It would be really awesome if when tasked with a project like the tribute page or portfolio, there will be an option to show a list of all the stuff we learned up until now and a short description of them.

for example, an entry talking about the ‘col-md-*’ class and one liner explanation, or something like that.

Yes, I know i can write them down at the end of each challenge but it would be a lot easier to just open this list.

What do you think?