SAP just released the new Web IDE Developer Guide for customers who use SAP HANA Cloud Platform.
If you are a beginner in Web IDE this guide can help you to get through the basics. You will find some tips and tricks on how to start with this tool, how to set up Git properly, and how to define connection to remote SAP systems.If you keep on reading you will find some optional but useful setting descriptions, for example how to enable code completion and how to configure the code editor. There are new changes in the new version of the Web IDE which are notable.The tool now has a Feedback form which allows you to send your opinion about the software.
As we can see SAP is working hard to adjust this tool as well as they can, so definitely this is the number 1 tool if you want to create or modify an UI5 application.