Inducing primary knowledge/skills require little effort or motivation, but acquiring secondary knowledge/skills require considerable conscious effort.

Johns Hopkins University

Non-intrinsic knowledge that must be learned. Humans can acquire this type of knowledge in general but do not have innate specific modular abilities of this type; for example, we have the neural structures that enable us to learn how to read or write, but we cannot read or write any specific language at birth. When learning this type of knowledge, humans acquire information from extrinsic information stores to integrate into their own (large) information store. 

Secondary Knowledge

Sweller, J. (2011). Cognitive load theory. In Psychology of learning and motivation (Vol. 55, pp. 37-76). Academic Press.

Cognitive Load Theory

Consequence of the Distinction between Secondary and Primary Knowledge

The manner in which secondary knowledge is acquired directly depends on the instructional design. 

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