Things to add to the new Elemental Guide

Hello Peoples,

I’m currently working on a new Elemental Guide. The main page is for the basic stuff, with links at the end of each section to the “more advanced/detailed” stuff. What I want to know is what extra stuff you think should be added to the guide. Obviously the advanced sections are a work-in-progress, and I have a few more things I want to add in, but I thought this would be a good time to get your feedback.