From macOS

We'll use createinstallmedia.
  1. Format your USB with these settings: Name: USB Format: MacOS Extended Journaled Scheme: GUID Partition Map

  2. Right click on your macOS installer app(from the previous step) and click Show Contents Packages.

  3. Go to Contents/Resources and find createinstallmedia inside that folder.

  4. Open Terminal.

  5. Type sudo [drag and drop createinstallmedia here] --volume /Volumes/USB and enter.

  6. Follow the instructions. Be patient as it will take a lot of time.

  7. Go to this page after finishing this part.

Step 1
Steps 2 - 6