The discussion highlights "An Introduction to General Relativity" by L.P. Hughston and K.P. Tod as a valuable resource for developing tensor calculus skills within the context of general relativity. It is noted for its concise approach and extensive problem sets that enhance understanding of relativity, causality, and cosmology. While not as advanced as other texts like Wald or Carroll, it is used in senior-level applied mathematics courses at Oxford, making it suitable for both mathematics and physics majors. The book is particularly appreciated for its engaging tensor calculus problems, which are seen as beneficial for mastering calculations needed in more advanced studies.