If an app you rely on is no longer in the App Store, there are a few things you can do to possibly get that app on to a new device. But there are no guarantees.
It’s not your fault. The feature is broken, but there are workarounds.
Plus, can HomePods manage surround sound? (No.)
Keep the original creation date of your pictures.
Searching with Google via Safari is the default, but you can use Automator to add others.
You might want to turn these features off, but you surely want to retain everything in them.
For those who don’t want to sync their email, just retrieve it, the location of messages isn’t always clear.
There’s a switch for that, but a second switch that needs more examination.
The Migration Assistant app can be used to transfer an account from one Mac to another.
If an ISP sets up their network insecurely, you could see other networks.
Sometimes pictures get rotated out of whack. You can fix it in Photos.
You can’t undo a deletion, but you can re-create it if you make a sort of backup.
It’s seemingly rare, but a glitchy GPU can pockmark your photo’s appearance.
If you erred in modifying the date a picture was taken, you can fix it with some effort.
If you want a different app to always open a particular file type, here's how to do it.