Please add a graphical key to the FAQs of all the sites that explains the meaning of colors and symbols found on the site, including the question lists / search results and the question and answer pages. The following question contains a lot of this information, but it was hard to find and should be much more visible (and possibly more comprehensive)! If I am missing something, please let me know.
If you're confused about symbols, pretty much every symbol will have a hover tooltip that explains what it does or why it's there. If you want a quick reference, here:
As for the colors, I don't see how they're that difficult to figure out that they warrant space in the FAQ.
The FAQ is meant to hold the most frequently asked questions, and I believe the questions that are in there summarize how to use the site in the best way possible. Adding in every detail to the FAQ eliminates the use of the FAQ. The more people see there is to read, the less they want to read it, and we certainly want people to read it.