OSU offers free access here, through the Columbus Metropolitan Library (CML), to Lynda.com's large selection of tutorials on various software and tools from the Microsoft Office Suite to the Adobe Suite, Tableau, and much more. You can sign up for CML membership by bringing your BuckID to Thompson Library, filling out a form with your Ohio address. You should receive your CML card and PIN right after, which you can use to access the Lynda tutorials.
Here is a list of just some of the Lynda tutorials related to data visualization. They will be edited in the future with summaries and recommendations. Note that there are a huge catalog of Lynda tutorials for many programs and tools and it can be overwhelming trying to figure out what is most useful for you and your needs.
Lynda has a whole section on Infographics here: https://www.lynda.com/Infographics-training-tutorials/1462-0.html
Here is a list of just some of the Lynda tutorials related to Microsoft Excel.
Tableau tutorials and training can be found on the official Tableau website as well as through Lynda.
Official Tableau resources:
Tableau Tip Tuesday