The list is literally endless, and more often than not specific to what you specifically need. Here are some things I have setup:

• If my wife texts me "911" it turns my ringer volume to 100%
• When my phone battery is below 5% and my home wifi is not nearby, it will send a text to my wife to let her know my phone might die
• I split my photos into different folders based on GPS coordinates in the exif data. I have one for home and work, then a default
• Backup files to my server when I am on my wifi
• Tracks how much time I am spending at work by checking when I am near my works WiFi
• Auto-enable Wire guard when I leave my home network
• Stores my phones location whenever it disconnects from my cars bluetooth (basically a local parked car location reminder)
• If I turn on my flashlight while pressing the volume down button it instead opens a "flashlight app" that is just a solid color on the screen. This allows me to use a light source without it being the full brightness of the flashlight. Nice when you have a sleeping partner
• I have been using DailyYou and forget to take pictures, so I have it open the app for me every 30 minutes after the reminder notification until I take the picture.

I have also used it previously for job specific tasks. Like I had a button on my home screen that would open a menu with a list of options, and then I would select one of the options. It just saved that selected text and the current time into a file so I could reference what time I did something.

If you have any sort of smart home, the options just keep growing.