I wanted HA to send me notifications whether I should bring my umbrella today and when the washer or dryer machines finish. Of course, HA has it's built in notifications to mobile apps, and while these would do the job, I wasn't sure all of my family install the mobile apps, so I wanted to tap on something we already have. Comparing different notifications options, I decided to go with Telegram, since it seemed the easiest (no need to create App in dev portal).
Disclaimer: I'm quite new to both HA automations and Node Red, so I assume much of this could be done more efficiently