For those interested in studying Category Theory, several key resources are recommended. The standard introductory text is "Categories for the Working Mathematician" by Saunders MacLane, a foundational work in the field. For beginners without extensive mathematical background, "Basic Category Theory for Computer Scientists" by Benjamin C. Pierce is noted for its straightforward approach. Another valuable resource is "Arrows, Structures and Functors: a categorical imperative" by Arbib, which is more accessible for those unfamiliar with advanced mathematical concepts. "Abstract and Concrete Categories" by Adamek, Herrlich, and Strecker is highly praised for its comprehensive theory and numerous examples, and it is available for free online. While some older texts by Peter Freyd and Barry Mitchell are mentioned, they are primarily focused on abelian categories. Additionally, a YouTube lecture series called "The Catsters" is suggested for clear explanations, although it is not a substitute for formal textbooks.