Your old Mac could be so confused that you want to start over with yourand move only a select group of files and folders. However, if you've lovingly cared for your old Mac and want to take on all or most of the files, apps, settings, and accounts, contact Apple's Migration Assistant.
This built-in utility lets you transfer data from your old Mac or a Time Machine backup to a new Mac. Let's get in there and get you up and running with your new Mac ̵
Setting Up the Migration Wizard
Before performing heavy lifting, it's always a good idea to back upin case something goes sideways. You can also make a quick run through your old Mac and delete anything you do not want to bring along.
Now that your old Mac has been backed up, the next step is to make sure both Macs are up-to-date and using the latest version of MacOS. Click the Apple Icon in the upper-left corner, click About this Mac and then click the Software Update button to check for updates.
Next, To use the Migration Assistant, your old Mac needs a name. To check if it has a name, go to System Preferences> Sharing and check the computer name field above.
Finally, connect both computers to AC power.  Read more :
Start the Migration
If MacOS Sierra or later is running on your old Mac, you can use your Macs connect wirelessly. Just make sure that Wi-Fi is enabled for both and that they are nearby and connected to the same network. (If you can not connect wirelessly, follow Apple's instructions for using the target disk mode and a cable connection.)
Open the Migration Assistant on your new Mac when your two Macs are lined up. Just search for it or search for it in the Utilities folder of your application folder. When the Migration Wizard opens, click Continue select [Transfer] from a Mac, Time Machine Backup or Startup Disk and then click Continue .
On your old Mac computer, open the Migration Wizard, click Continue select on another Mac and click Continue .
Now go back to your new Mac. You will be asked if you want to migrate from a Mac, Time Machine backup, or a boot disk. Select Click on another Mac on Continue and make sure that the security code is displayed on your Mac when you see one. The name of your old Mac will appear in the Migration Assistant window on your old Mac. Select it and click Continue .
You will now see a list of items to transfer: applications, your user account, other files and folders, and computer and network settings. Highlight the items you want to bring to your new Mac. If your new user account has the same name as the user account on your old Mac, you will be prompted to rename or retain the name and replace the user account you set up on your new Mac. Click Next to begin the migration.
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