Tacit (implicit) knowledge at wikipedia
Received knowledge (friend, teacher, apparent authority, expert)
Explicit, Implicit and Tacit Knowledge

Explicit knowledge at wikipedia
Knowledge acquired by study
Knowledge acquired by participation
Factual knowledge (what)

Procedural knowledge (how)

Relational knowledge

Knowledge as social construct

Wisdom (metacognition) (why, why bother)

Internal coherence, External (social) coherence

Knowledge can also be seen as a network diagram
The nodes represent items of knowledge
The edges represent the relationships between them
Motivated reasoning