This article provides a scholarly analysis of the role of the First Turkological Congress, held in Baku in 1926, in the development of Turkic languages. The key linguistic issues raised within the framework of the congress — such as script reform, norms of the literary language, terminology, dialectology, and the idea of a common Turkic language — are examined from the perspective of theoretical linguistics. In addition, the article offers a comparative analysis of the roles played by the Uzbek and Azerbaijani languages in these processes, focusing on their phonetic, lexical, and grammatical features. Drawing on reliable sources and academic literature, the study reveals the impact of the resolutions of the First Turkological Congress on the subsequent formation and development of Turkic languages, including the Uzbek and Azerbaijani literary languages.