Daily Energy Usage from Energy Flow Card

i’am using the Energy Flow Card Plus. Withing the graphic there is the home usage of energy. How can I grab the value and sum them up? + reset them every day. That I can see my daily KWh usage of energy?
(I already understood -HA is not very easy for beginners -I’am one these beginners with not very much programming experience.)
Many thanks

To count and reset something daily use the Utility Meter.
For sums you need a template sensor like here
But I am not sure what you described, so I hope this helps. If not, please provide more details.