This is a great website to read just to know what could be wrong with Mojave after you have updated to it, and what you can do to fix what’s broken.
https://blog.macsales.com/46143-macos-101-what-mojave-broke-and-how-to-fix-it
Here are the things that are covered:
SMS Messages (to non-Apple devices) not delivered
Weird fonts
Bluetooth devices not connecting to your Mac
Freeze or slowdown at login
Apps no longer working
Apps and security changes in Mojave
32-bit apps and other non-working software
John R Carter Sr