If on a system that's three or more major versions back, we recommend the introductory course:CRM: CRM Boot Camp for Dynamics 365ERP - Front Office: Core Functionals and Financials for Finance and OperationsERP - Technical User or Admin: Core User Boot Camp for Finance and OperationsAlthough users of previous versions may have years of experience, PowerObjects has found that three major versions seems to be where the learning curve becomes difficult to manage internally without guided training.  It's not required, but this cadence is recommended because it's when previous customers have mentioned they've found value in returning.