To learn more about how to use Esri's ArcGIS software suite, online self-guided tutorials are available through the Esri Virtual Campus.
Please contact firstname.lastname@example.org via e-mail to have her set you up with an organizational Esri account. Then you will be able to self-register for a course. Only web courses authored by Esri (top left in the catalog description) are available to us for free.
There are many online courses and tutorials to learn more. Here are a few examples: