This blog post delves into understanding the internals of Gremlin and provides a deeper insight into its query language to master it. It explains how to create a schema for KillrVideo, import data, and execute various traversal operations using Gremlin. The text also discusses the type of expressions in Gremlin, such as g.V(), and how they can be used to retrieve specific properties from vertices or edges. Additionally, it covers grouping and counting operations, unfolding nested collections, and performing projections on vertex properties or complete traversals.