Having a thumb drive with all your favorite portable apps ensures you can get to work immediately on any Windows computer.
If you use Flatpak apps on Linux, do yourself a favor and install Bazaar to make your app management life a bit easier.
We all have our best Android apps, but what about those apps that fulfill unique needs? I look at the unusual Android apps I always install.
You can't run iPhone apps on a Mac computer without an emulator, though that will change with a new set of Macs, coming out by the end of 2020.
Your iPhone apps should update automatically, but if they aren't, you can check for updates manually through the App Store.