I am starting with sonoff dongle and zigbee2mqtt.
For my first steps I got a LEDVANCE Classic E27 MULTICOLOR.
I am able to switch on and off, brightness, color temp, and colour with node-red mqtt nodes.
But I don't understand how the bridge and the other nodes of node-red-contrib-zigbee2mqtt works.
I would very much appreciate getting some help or a sample flows
I can't answer your question, but just saying that I don't use that node. I use the standard MQTT nodes with zigbee2mqtt, rather than using a non-core node. For me the contrib node doesn't do anything particularly useful.