Besides the SAP Cloud Application Studio documentation (SAP Cloud Applications Studio – SAP Help Portal Page) and the how-to documents provided in this forum, there is a third information source that you should consider when writing applications with SAP Cloud Application Studio: the development guideline. The development guideline is located here https://wiki.sme.sap.com/wiki/x/ngRIF. -> Development Guideline for Add-Ons.
You need access (user / password) to the SAP SME wiki to access the guideline.
The guideline is mandatory to pass the SAP quality review. But even if you do not require the SAP quality review we recommend that you follow the rules of the guideline to provide good quality of your development.