Hi Abir:
There are a variety of programs for Ariba available at the SAP Learning Hub. The Hub offers self-paced eLearning versions for most of the Ariba classes. You can identify them by the "e" in the name, for example AR510e is the e-Learning version of AR510. Here's a link to the e-Learning catalog: https://training.sap.com/shop/sap-search?q=*&refine%5Bsolution%5D%5BCloud%5D=Cloud&refine%5Bsub-solution%5D%5BAriba%5D=Ariba
Cheers,
Debbie Curtis-Magley
SAP Ariba Exchange Community Manager