SIMPLE UI5 AND FIORI ARTICLE

The best Way to start Understanding UI5 will be to abide by below video series on Anubhav Trainings. You typically start with HTML5, CSS, JS, and jQuery after which move to SAP UI5 Framework and Fiori Development with MVC. In the final section learn OData Solutions around the Gateway server. All of this with out copy-paste of code with line by line