Why are the dates of some events in history given approximately?

This is due to the peculiarities of science and methods of its study. If we are talking about rather ancient times, then most often the dates are determined on the basis of examinations of objects, which, albeit quite accurate, but sometimes cannot perfectly accurately determine the age of a thing, therefore the date will be approximate. If we talk about later stages, for example, the early Middle Ages, when written sources become the main way of knowing history, then the inaccuracy in determining the dates is associated with discrepancies in the chronicles of different authors.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.