I don't have knowledge on SAP ABAP, Can I start to learn SAP FIORI?

 Fiori is design principles to make UI for SAP Application, So while learning fiori, UI5 is required not ABAP. You can learn SAP FIORI without having the knowledge of SAP ABAP (programming function) because SAP FIORI is a UI – User Interface (intermediate between user and apps) based application…Reference purposes you can check this video:-

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