excel training courses

excel courses on pluralsight
http://www.pluralsight.com/training/Courses/Find?highlight=true&searchTerm=excel

Excel 2013 from gcflearnfree.org
http://www.gcflearnfree.org/excel2013

Tutorial – Excel 2013 – 10 Things you must know
https://www.youtube.com/watch?v=p8fCzfUvwak

Excel 2013 for dummies
http://www.dummies.com/how-to/computers-software/ms-office/Excel/Excel-2013.html

Microsoft Excel 2013 Tutorial For Beginners #1: Crash Course Data Entry Formulas Formats Charts 365
https://www.youtube.com/watch?v=Z1xHvWjJtOo

 

Excel Addins

Excel-DNA
https://github.com/Excel-DNA

excel dna blog
https://excel-dna.net/blog/

Self Extending UDFs – Part 1
https://github.com/Excel-DNA