The statement "Facts can be made up too."
Is that a fact? (Pun intended.)
If yes, are we making it up or is there an objective standard by which we can determine fact from fiction?
If no, then you are dealing with subjectivism with all its inherent errors.
Unless we have a method to determine fact from fiction, knowledge, all knowledge without limitation, is impossible.
Knowledge is the correct identification of the facts of what exists, of reality. This is the most straightforward definition that I have encountered. It is an important concept to keep in mind. For example, suppose you hold a belief that does not correctly identify the facts of reality. In such a case, that particular belief is not knowledge.
Aristotle’s Laws of Logic start with: A is A. A thing is what it is.
Knowledge is a familiarity, awareness, or understanding of someone or something, such as facts (propositional knowledge), skills (procedural knowledge), or objects (acquaintance knowledge). Of course, knowledge can be acquired in many different ways and from many sources, including but not limited to perception, reason, memory, testimony, scientific inquiry, education, and practice. This is the philosophical discipline for the study of knowledge and is called epistemology.
The definition of knowledge is a matter of ongoing debate among epistemologists. The classical definition specifies that a statement must meet three criteria to be considered knowledge: it must be (1) justified, (2) true, and (3) believed.