For what reasons can the information be unreliable?

1) Intentional distortion (misinformation) or unintentional distortion of a subjective property;
2) Distortion as a result of interference (“damaged phone”) and insufficiently accurate means of fixing it.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.