Solved
Adobe Certification Program
I'm keen to sit for a certification, which are the ones for 1:1 customer journey?
If I were in you shoes I would start with AEP Business Practicioner. AJO is build on top of AEP so it would be much easier to understand core concepcts.
Then AJO Business Pracitioner: https://certification.adobe.com/credential/verify/3ce6c9e3-bf61-11ef-8f8b-42010a40001c
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.