Tasker

Make your phone a real smart phone! You don’t have to think about changing the volume every day when you leave the house when you can on your phone.
Automate based on the state and events of the apps you’re using, the time of day, your location, your Wi-Fi network, the SMS or call you received, the song you’re playing, and much more (130+)!
See how easy it is to create automation. https://www.youtube.com/watch?v=s6EAbLW5WSk

Action

With over 350 actions, you can truly customize your phone like never before. Send SMS, create notifications, change almost all system settings such as Wifi tether, dark mode, Always On Display, change volume, control silent mode, open apps, manipulate files, control music playback, locate your location Detect… . If you can think of it, Tasker can probably do it for you!
Note:
root is NOT (I repeat NOT) required for majority of the functions. However, a few of the actions (like the Airplane Mode action and the Mobile Data action on some devices) require root. This is because of Android security policies that developers cannot work around.

Automatic File Backups

If you set it up to do so, Tasker can automatically backup your files to a specific folder on the device, SD card, USB key or even Google Drive! This is useful if you want to keep your files safe even if you lose your phone.

Other Triggers

Manually trigger your actions via launcher shortcuts, quick setting tiles, widgets, long-pressing volume buttons, media buttons (like the ones on your BT headsets or headphones), Bixby button, Navigation Bar, Notificaitons and more!

Scenes

Design your own UI and use it to display any info you want or trigger any task!

App Creation

Create your own standalone apps to share or sell with the Tasker App Factory :
https://play.google.com/store/apps/details?id=net.dinglisch.android.appfactory