I use NodeRed extensively with home assistant, here's an example of a flow:

My front door opens (trigger) > turns lights on, but then also: > wait 3 minutes > check if my or spouse's phone is pingable > if neither phones are pingable then turn off all lights, AC units, and enable house alarm

Also another flow that's uses daily: 8:30pm(trigger) > check which house lights are on > any light that is on trigger a gradual temperature shift to warm and brightness to 50% over 10 minutes