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i assume you are referencing the gemara in bava batra which lists king hezekiah and his colleagues as the redactors of those books. redacting and authoring are two different things although similar. traditionally it is accepted that king solomon authored, or at least is the source, for most of the content in those books. the idea that hezekiah compiled them is strengthened by the book of proverbs itself in 25:1. the wisdom of king david can also be found in proverbs as well as that of a king lemuel although the latter is identified as solomon by traditional sources.
Like any library, Mi Yodeya offers tons of great information, but does not offer personalized, professional advice, and does not take the place of seeking such advice from your rabbi.