I am wondering if it is correct to replace,
Learning English Language: A New Policy For Using Ell.stackexchange
Learning English Language: New Policy For Using Ell.stackexchange
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"Policy" can be either count or non-count. Omitting "A" suggests the non-count meaning a category of principles, guidelines, plans and rules. Including "A" suggests the countable meaning "A document expressing policy, or a collection of principles etc. that are sufficiently aligned to be viewed as a singular thing.
Policy should not be developed in a vacuum (non-count)
We have been developing policies to deal with cheating. (count)
In this case, it doesn't really matter much. If this policy is expressed in the document then it is "A policy".