Quote Originally Posted by Simon000001 View Post
привет

В чём разница между словами "постичь" и "понять"?

Спасибо
Just use "понять": it is more widely used. "Постичь" is the same as "undersand", only more bookish and implies a deeper degree of comprehension: full understanding, getting to the essense of things.

The other difference is, "постичь" has a second meaning, "to happen" (usually about something woeful).