New Mac Clean Installation
When you do a clean installation, you let macOS run its
Setup Assistant and create a new, empty user account. During
the process, you enter some information, such as your Apple
ID, so your iCloud account is activated, but, for the most
part, your Mac will be a tabula rasa-a blank slate. It will
contain the default apps that are part of macOS, but nothing
If you go this route, you then must manually copy files from
your old Mac, or from a backup. This part of the process can
be time-consuming, but it can allow you to sift through your
files to find what you really need, and slim down your Mac.
When you do this, you may be surprised to find how much you
can ignore from your old Mac.
Your Home Folder: you want to copy most of the files from
your home folder (that's the folder with the house icon and
your username). You don't want to copy the folders at the
top level of your home folder-Desktop, Documents, Downloads,
Movies, Music, and Pictures-but rather the contents of these
folders into the identically-named folders on the new Mac.
Again, take this opportunity to check whether you need to
keep all of the files in these folders.
Review - How to Select Files (or Folders)
AirDrop (Files from Old Mac Directories to New Mac Directories)
Transfer (Files from Old Mac Directories to New Mac Directories)
using lightning fast SSDs (Old to SSD) then (SSD to New)
Your Sandisk Portable SSD May Require a Firmware Update
https://support.apple.com/en-us/HT201250 (Time Machine)
AirDrop or use SSDs to transfer ~/Library/Mail content from
Old Mac to New Mac.
Third Party Applications
Install third party applications from the web to ensure that
you have installed the latest versions that are compatible
with your new Mac.
Security Settings (Finder, Safari, and System Preferences)