knowledge is a noun that is defined as an understanding of a subject gained through experience and/or study. In English, knowledge is uncountable.
when used as a noun, the typical use cases for knowledge are related to gaining information, expertise, or understanding about a certain topic.
1. 'I gained a lot of knowledge about the solar system in my science class.'
2. 'Her knowledge of the problem was surprisingly large.'
3. 'His knowledge on the subject was considerably less than mine.'
tips for using knowledge as a noun include avoiding the use of 'a knowledge' (knowledge is already singular) and being careful to use it as a singular entity (instead of multiple pieces of knowledge).