When we are writing a reflection for our competence in educational practice, we might talk about "skill" and "knowledge". Sometimes we may put them as the same stuff but actually "knowledge" refers to a particular concept in certain domain, while "skill" refers to the ability of manipulating the knowledge in a particular context. That is, "knowledge" is about the theories, but "skill" is related to application. There is a great passage with a detailed explanation on both terms at http://www.differencebetween.net/language/difference-between-knowledge-and-skill/