HA Core -- trying to create a template: light in yaml get error that light is an invalid template

Configuration
1

I am running HA core 2024.8.1 with Frontend 20240809.0. I am trying to learn and am new to HA. I have a node that sends periodic data up to HA in the form of temperature. I am able to send down an MQTT publish event to turn on an LED and have it report back it’s value. I would like to have a symbol update and change as an example mdi:led_on and mdi:led_off when the node returns it’s value. I have tried everything but don’t seem to be getting it. Currently I get the error that light is not a template? Can someone tell me what I might be doing incorrectly?

configuration.yaml

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When configured in YAML you need to use the legacy format, there are various differences such as it should be under the top level key light not template…

light:
  - platform: template
    lights:
      mqtt_write_led:
        friendly_name: "MQTT Write LED"
        value_template: |
          {% if is_state ....
3

Maybe I need to step back …
It appears HA Core doesn’t have the ability to use add-ons etc. and I have exhausted the fact thru ChatGPT that it does not seem possible to change the color of a light from on to off and vice versa using Core. So the next logical thing would be to change the mdi:led_on to mdi:led_off to represent when an MQTT node published event reveals on and off respectively…Is this possible?

Seems Core is somewhat tricky…Unfortunately I am running on an RPi5 and I have a lorawan network so I do not want to run HA OS as it has not been tested on RPi5.