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Seriously, can we edit the [censored] title?
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Unless you mean to correct it by saying "Off what grammatical errors really piss you?" ...just kidding, but if the usage of "what" in my title is incorrect, then please explain to me how that is the case.
From:
Google-searched which vs. what
“What is the best way to explain…?” What is used to ask a question when there are an unknown number or infinite possibilities for an answer. You know that there are many, many ways that exist to address your question, and you want to find out—from all those possibilities that you might not even know about—what the best way is."
"You can use which when you have a very small or limited field to choose from."