How to learn SAP workflow for S/4 Hana Applications on FIORI based ?

Hi Team,

I am developing some custom workflows on ECC based and developed Odata services also.. But I want to develop a Custom workflow on FIORI based. So Could you please help or share any kind of stuff for developing workflows on FIORI based... it will help me a lot.

Thank you.

Kind Regards

Dilip Kumar K