Hi Tobias,
It would be good to do a self study unless you need a certification in the topic.
https://websmp110.sap-ag.de/~sapidb/011000358700000661052013E/Index.htm
is the link for the same, else you may navigate to https://service.sap.com/asap and then to ASAP 8 for Agile.
Also if you want to get trained in ASAP 8 (not Agile specific) you may want to look for C_PM_71 certification in the learning link of SAP at https://training.sap.com
Warm Regards,
Ranjith Raghunathan