When I update my product title for keyword optimization, do I update parent sku, child sku or both?

Hi
When I update my product title for keyword optimization, do I update parent sku, child sku or both?
Updating parent sku title is much easier than child sku title. Also I saw some people mentioned in forum that, they have to rebuild their keywords ranking after updating. How can I prevent rebuilding keyword ranking?
Any advice is welcome and appreciated.

Thank you
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