This year I'm doing two separate Massive Open Online Courses, one in English, which begins in June —registration is already open, so sign up— and another one in Spanish (more information soon; this one will likely be around October.)
In these free courses I cover the basics of data visualization and teach a few tools I love, such as INZight and Flourish. I have some tutorials about them here, as you may remember, in case you're interested. In the course I asume you have no knowledge of visualization, so recommend it to friends and acquaintances who you know want or need to learn it.
Here's a screenshot of the video tutorials of the MOOC in English; I felt we needed something else other than me and my computer in them, so I put some books from my home office shelves on the desk: