Today was my first venture into editing a page within Wikipedia and I found it to be a relatively easy learning curve. Wikipedia is amazing in that anyone in the world can edit a Wiki page with seemingly nobody to review / approve edits before they are posted for the world to see. It is a self-policing community.
I updated the page created by Maria Drujkova on Multiple Representations. In particular, I added links to half a dozen other Wikipedia pages to make Maria's page a bit richer.