Greetings:
Access to Ariba Connect and documentation are available to licensed users and official partners. You can access training at openSAP. Here's a link to the Introduction to Ariba course: https://open.sap.com/courses/bnar1
You may also want to invest in an SAP Learning Hub subscription to access more Ariba training.
Regards,
Debbie Curtis-Magley
SAP Ariba Exchange Community Manager