Hi,
For AX 2009 and AX 2012, They should be given training on:
1)Microsoft Dynamics AX Installation and Configuration (AX 2009 or AX 2012)
2)Microsoft SQL 2008 R2 or 2012 or for AX 2009 Oracle (Installation and Configuration) How to backup,restore,copy,add or remove and fetch records from DB.
3)Microsoft Server 2003,2008 R2 or 2012
4)AD