I don't have information on SAP ABAP, Can I begin to learn SAP FIORI?

Sure you can begin with both of the innovations. Assuming you are somebody who loves composing questions then ABAP is the one you should start with. Assuming you have some information in Java or some other programming dialects then you can learn SAP Fiori. You can begin gaining from the documentation given by SAP to this. Utilizing each tag and how information restricting is done in them is the central thing you should zero in on. When you are alright with SAP Fiori, I would prescribe you to become familiar with some ABAP too as full-stack engineers are consistently in the interest.

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