Simple UI5 and Fiori Article
The Right Way to get started on Mastering UI5 is always to abide by under video sequence on Anubhav Trainings. You typically start with HTML5, CSS, JS, and jQuery and then shift to SAP UI5 Framework and Fiori Progress with MVC. In the last section find out OData Products and services about the Gateway server. All of this with no copy-paste of code