Clean install of high Sierra

I did a restore from an AirBook that has slightly different hardware then the target.  I did a full TimeMachine restore.  The entire computer is now super slow.  I want to wipe the target one and start over .  Don’t I have to create a bootable USB OS?  What are the steps ?
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Adelaido JimenezDevOpsCommented:
This is the steps I usually take.
1. take a backup if you are worried about any data lose.
2. You need to create a bootable drive of macOS High Sierra , before reinstalling the OS again. Go to the Mac Store and download the OS install
3.Restart computer and  hold down Command-R to open in recovery mode.
     *Click on Disk Utility in the OS  X Utilities
     * Select your Startup Disk, and click Erase tab at the top of the window
    * Click Erase to confirm
This will delete everything from your disk
4. Reinstall a new copy of macOS using your bootable drive you created.
gopher_49Author Commented:
Can you elaborate more on step 2?
Adelaido JimenezDevOpsCommented:
How to create a bootable usb flash drive.
1. Download the macOS High Sierra from the macStore
2. Make sure you have and external drive that is at least 12 GB in size.
3. format the external usb drive so that your mac can read it, Should be formatted as Mac OS Extended (journaled)
4. open a Terminal, located in the Utilities folder of your application folder.
5. Type the following command  in the terminal
              sudo /Applications/Install\ macOS\ High\ --volume /Volumes/MyVolume
 Note: replace MyVolume to the name of your volume
6. Press Enter when ready
7. Type your administrator password and press enter again.
8. Follow the prompt that display, by confirming the volume erase.
9. Terminal will show the progress of the bootable installer creation.
10.Quit the Terminal when done.
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gopher_49Author Commented:
Awesome!  I'll handle here shortly.

Is this a newer MacBook Air?  You should be able to boot into Recovery Mode and just erase the Disk before you run the install.  When you open Disk Utility, is there a recovery partition?  If there is, just boot into recovery mode, Select Disk Utility, Select Erase Partition.  After that's done Exit Disk Utility, back to recovery mode, then select Install OS X.

You only need to create a USB boot disk if you have an older Mac that predates Mountain Lion and don't have a recovery partition.

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gopher_49Author Commented:
Both options work but the built in recovery is even easier .  The first option is better if you want to specify the OS
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