How can I translate a theme?

We recommend using a tool that will help you create your localization files instead of creating them manually.

This official WordPress resource details how to localize themes: https://developer.wordpress.org/apis/handbook/internationalization/localization/#translating-themes-and-plugins

The Poedit tool can be used to create your localized files using the themeName.pot file as a base, you can find more information about it here: https://developer.wordpress.org/apis/internationalization/localization/#generating-pot-file