There are many online (reputable) courses--check Coursera (scroll down to Courses and Specialization); Harvard, MIT, Cornell, Northwestern and many others offer certificate courses.
Library of free DataViz examples, tools to help create visualizations and maps.
GitHub Code examples for and based upon d3 and his book “Interactive Data Visualization for the Web” .
Voyant (word frequencies, concordance, word clouds, visualizations)
Illinois State University
Campus Box 8900
201 North School Street
Normal, Il 61790-8900