This is a good question.

Practical knowledge is knowing how to do something - tie your shoelaces, instantiate a model class, authenticate to an LDAP server.

Theoretical knowledge is knowing what is the case - that the cross-flow valves must be closed at take-off, that everything in Python is an object, what a Python property decorator does.

Technical reference is theoretical knowledge (that you apply in practice), as is explanation. Tutorials and how-to guide contain practical knowledge.