Linked from
The 34 pages that link to Chain rule, each with the reason it gives.
DerivativeRelated: It handles derivatives when one function is nested inside another.
GradientRelated: It explains how gradients transform when coordinates or variables change.
CalculusRelated: It lets derivatives track how change passes through nested dependencies.
Function compositionRelated: It computes derivatives by tracking each function in the composition.
Differential calculusRelated: It carries rates of change through nested functions.