Do you have a pointer to a "Hello world" example? Something like, turn a light on at 07:00? I think I have Node Red installed, but it's very unclear how it's connected to HA.
I know it's a long video, but this is the best crash course I found on it. https://youtu.be/SuoSXVqjyfc It's worth watching that because it'll intro you to all the terminology and the way of thinking that Node Red requires.