SIMPLE UI5 AND FIORI ARTICLE

The best Way to get started on Mastering UI5 will be to stick to below movie sequence on Anubhav Trainings. You typically get started with HTML5, CSS, JS, and jQuery after which you can transfer to SAP UI5 Framework and Fiori Development with MVC. In the last section understand OData Services about the Gateway server. All of this with no copy-paste