In every basic course or book of knowledge, you'll find next to the definition of knowledge, an explanation what tacit knowledge is.
Often the difference between explicit and tacit knowledge is made in difference of the information in a book on how to drive a car, and really driving a car.
I prefer an example already done by Lazarus and Mc-Cleary in 1949: these psychologists presented persons a large number of nonsense syllables, and after showing certain of the syllables, the administered an electric shock. After a while the persons showed symptoms of anticipating the shock at the sight of "shock syllables". The persons could not define HOW they could could identifythe "shock syllables". The persons came to know when to expect a shock, but they could not tell what made made them expect the shock.
...this means there are different kinds of tacit knowledge,
each to be treated in different ways!