How to setup a useful Energy dashboard

I’m quite new to Energy dashboard and quite confused about it. After some thinking, I guess my main goal is to know which devices are using the most energy, and to monitor them for any unanticipated changes over time.

  1. There are Sources, I have a 1 sensor added, which uses the Riemann Integration on a power (W) sensor, which is a total cumulative energy (kWh) consumed so far, correct?
  2. The Energy Usage chart seems to come from Sources, but can be broken down into Day, Month, Year, correct?
  3. Then there is Monitoring Individual Devices, from a Tasmota perspective, what am I supposed to include here? ENERGY Total or ENERGY Today, I mean, which one makes more sense from a charting and monitoring point of view? Or what do you guys use and why?