A WordPress child theme is the recommended method for durable customizations. It lets you modify styles, templates or functionality without affecting the parent theme when it is updated.
For any website that evolves over time, this separation is essential. Otherwise, theme updates can overwrite the changes and create unnecessary rework costs.
When you need a child theme
You need one when you want to modify the layout, add custom styles, change template files or adapt functionality to the project's needs.
The main advantage
The advantage is control: you can keep the theme up to date while preserving the customizations required by the brand or online store.
At Webhat, we use this approach in projects that need proper customization and maintenance over the long term.