My Top 5 Favorite Simple Automations

Number 5: Open Window / Disable HVAC

Blueprint: Window Open Climate Off

Open your Home Assistant instance and show the blueprint import dialog with a specific blueprint pre-filled.
https://community.home-assistant.io/t/window-open-climate-off/257293

Number 4: Closet / Pantry Light

Blueprint: Door Control with Light Delay

Open your Home Assistant instance and show the blueprint import dialog with a specific blueprint pre-filled.
https://community.home-assistant.io/t/control-a-light-with-a-door-state-with-an-optional-on-time-condition/340021

Automation: Turn off the Light after 15 minutes

alias: Timer - Pantry Light Off
description: ''
trigger:
  - platform: state
    entity_id: binary_sensor.pantry_door
    to: 'on'
    for:
      hours: 0
      minutes: 15
      seconds: 0
condition: []
action:
  - type: turn_off
    device_id: 6e5f70a39b68719dc7001a67c293f019
    entity_id: light.pantry_light
    domain: light
mode: single

Optional Blueprint: YAMA (Yet Another Motion Automation) –

Open your Home Assistant instance and show the blueprint import dialog with a specific blueprint pre-filled.
https://community.home-assistant.io/t/yama-yet-another-motion-automation-scenes-ambient-light-and-some-conditions/257062

Number 3: Humidity-Controlled Fan

Blueprint: Humidity Controlled Fan with Baseline –

Open your Home Assistant instance and show the blueprint import dialog with a specific blueprint pre-filled.
https://community.home-assistant.io/t/turn-a-fan-on-and-off-based-on-the-difference-between-a-humidity-sensor-and-a-baseline/255999

Number 2: Motion-Based Lights

Open your Home Assistant instance and show the blueprint import dialog with a specific blueprint pre-filled.
https://community.home-assistant.io/t/yama-yet-another-motion-automation-scenes-ambient-light-and-some-conditions/257062

Number 1: Basement Automation

No Motion – Turn off Lights

alias: No Motion - Basement Lights Off
description: ''
trigger:
  - platform: state
    entity_id: binary_sensor.basement_motion
    for:
      hours: 0
      minutes: 15
      seconds: 0
    to: 'off'
condition:
  - condition: state
    state: 'off'
    entity_id: binary_sensor.door_window_sensor_158d00023b0271
action:
  - service: light.turn_off
    target:
      entity_id:
        - light.basement_lights
        - light.studio_background_lights
        - light.basement_stairs_bottom
        - light.basement_stairs_middle
    data: {}
  - service: notify.telegram
    data:
      message: 'Turned off basement lights. '
  - service: tts.cloud_say
    data:
      entity_id: media_player.kitchen_display
      message: 'I just turned off the basement. '
mode: single

Turn on Basement Lights

alias: Door - Turn on Basement Lights
description: ''
trigger:
  - type: opened
    platform: device
    device_id: ebfc1720202846fa9bb1afa61a17b62a
    entity_id: binary_sensor.door_window_sensor_158d00023b0271
    domain: binary_sensor
condition: []
action:
  - type: turn_on
    device_id: dde41b08f53de82d4e2788070fb5c53f
    entity_id: light.basement_stairs_middle
    domain: light
    brightness_pct: 100
  - delay:
      hours: 0
      minutes: 0
      seconds: 2
      milliseconds: 0
  - type: turn_on
    device_id: bfdf09485258c422204820fa187a33fe
    entity_id: light.basement_stairs_bottom
    domain: light
    brightness_pct: 100
  - delay:
      hours: 0
      minutes: 0
      seconds: 2
      milliseconds: 0
  - type: turn_on
    device_id: 99654b16c95e0c93c0626d4f753b1add
    entity_id: light.basement_lights
    domain: light
    brightness_pct: 100
mode: single