Create a Child Theme Before Customizing a Classic WordPress Theme

Example: one article template change

Suppose the only requirement is a different article metadata layout. Copy the relevant template to the child, change that component and leave unrelated templates inherited. Copying the entire parent theme makes future updates harder to understand because every copied file can become outdated.

Maintain the customization

Keep a short list of overridden files and the reason for each override. After a parent update, compare those files with the new parent versions and test the affected pages. A child theme protects your files from being overwritten; it does not guarantee that custom code remains compatible forever.

For a block theme or Site Editor change, review the block-theme customization workflow separately rather than treating classic PHP-template instructions as universal.

Related practical guides

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Primary reference and editorial scope

Primary reference: developer.wordpress.org

Prepared on October 18, 2026. This is a source-referenced practical guide with illustrative examples, not a claim of hands-on product testing. Check current platform documentation before changing a live site.