How to Configure OpenEMS(www.openems.io)?

-What is OpenEMS? -What backend DB does OPenEMS require? -To do the customization on the OpenEMS, is it to be done on the Edge or in UI? -What changes can be done on the OpenEMS UI? -Do we have a web portal to view and monitor the device connected with OpenEMS? -How to configure and run the OpenEMS platform? -How to Deploy OpenEMS Edge & UI? -What type of server is needed to host the OpenEMS platform? -What kind of technical expertise is needed to develop/customise the platform?