People who educate are not necessarily linked to schools or schooling. Parents for example could be primary educators of children. Moral, social intellectual instruction usually begins at home, for better or worse.
Schooling is not the same as educating. A person may be well schooled at deception or tactics of manipulation but remain quite uneducated in the law of Karma or the laws in Parma when it was founded by the Romans in 183 BC, or the origin of Parmesan cheese...
We may be taught many and various curriculums, doctrines, and fictions in our schooling days, but the acquiring of an education is a personal practice. If we rely on others to educate us, we practice a sort of outsourcing of information, or data, much like the machinery of intelligence instead of mastery.
To know is to be absolutely certain or sure after observation, inquiry, experience, and sometimes intuition-if one has worked to acquire this aspect of consciousness and not been miseducated in the term .
We can be absolutely certain about something we have been told by anoither person, or a book, an iphone, a podcast,...which leads us only to know what someone else has claimed to know.
So, maybe we know the person who has passed on the knowledge or information. To know. and perhaps trust, another person's knowledge would constitute the same absolute certainty. By observation of the person's life or legacy, or works, or by direct inquiry and experiences with the person by way of a relationship and engagement of intellect.
How many teachers have we actually known beyond the classroom or school, the instittution of education?
In the end the clear method of certainty about an education is simply to ask yourself, ...How do I know this...
Of course the amusing prerequisite is to know yourself first.
Wasn't that always the first teaching?
And then, Educate Thyself.