How do I restore my iPhone 6 without a MacBook?

Straight from the linked article:

1) Connect to your computer

Connect your device to your computer using the cable that came with your device. Don't disconnect your device from your computer.

Further down:

Or on your Windows PC, make sure that you've installed the latest version of iTunes.

Restoring your phone requires a Mac or a PC.

issabella17 Said:

"what if i dont have a Mac book: how do i restore my iphone 6 with out macbook"

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Restring iPhone:

Use another Mac model. If pre-Catalina, use iTunes. On a PC, you'd use iTunes.