Welcome to SAP Ariba! It's great to see new users visit our community to learn from our members.
I shared your question with Tim Fabinak from our Education team. Considering the solutions that you're using, he suggested the following e-learning courses available at the SAP Learning Hub:
AR110E - Ariba Sourcing: Creating Events
AR210E - Ariba Contract Management: Creating Contracts
AR310E - Ariba Supplier Performance Management
AR320E - Ariba Supplier Information Management
AR510E - Ariba Procurement: Requisitioning to Receiving
AR520E - Ariba Procurement: Managing Contract Compliance
AR530E - Ariba Procurement: Creating and Managing Invoice
If you decided you'd like more in-depth, hands-on training, check our recorded BPC webinars for solutions. Here is the link to those sessions http://www.ariba.com/help/ariba-answers/buyers/drive-optimal-results-from-your-ariba-solutions
SAP Ariba Exchange Community Manager
I would like know, if exist some certification for the Functional Leader that participates in the implementation of Ariba in the company. In my case, solution Sourcing, Contract and SPIM.