Got started with SAP BTP, ABAP Environment by creating a trial user and ABAP cloud project.
"Used the SAP Cloud Application Programming (CAP) Model to mock an S/4HANA API, call it with SAP Cloud SDK, and build out a custom app with CAP that uses custom logic to consume that S/4HANA API as part of the business domain design.
As part of Devtoberfest 2021 - completed tutorial: Create Table Persistence and Generate Data