How to create a bootable USB drive

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If you're currently running macOS Mojave, click this link to find the Mojave installer in the App Store. For Catalina, click here.

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After the downloading process is complete, close the App Store. The installation window should appear afterwards.

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Insert your USB drive into your Mac's USB port.

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Launch Terminal.

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In Terminal, type one of the following commands, depending on your version of macOS. (The name of the version of macOS, is the one you want to install on the key and downloaded.)

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For High Sierra : sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ High\ Sierra.app

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After correctly entering the command with the name of your USB drive, press the [return] key.

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When Terminal indicates the process is "Done," the creation of your bootable drive has succeeded.