What is the best way to update a vectorstore and how to?

I was not able to find an answer about this: If I use let’s say add_documents or add_texts, instead of from_* in an existing index with an existing namespace, what is the difference?
Because I need to understand what is the best way to update a vectorstore, for example, if I created vectors from a content retrieved from a website page, then the page gets updated with different info, and I wanna update the vectorstore, do i need to erease it or there is an efficent way to update it?
PS: I am using LangChian

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