I think many people who study History will tell you that the first thing you learn from History is that no one learns from History - people go on making the same mistakes over and over again.
Nevertheless, I think everyone needs at least a passing aquaintance with the past of their country, better still how their country's past fits in with the past of other countries - without this knowledge, it would be very difficult to think with anything approaching a sense of perspective, surely the mark of an educated mind. The moves from knowing a few key highlights (Alfred burning the cakes, Charles hiding in an oak tree, for example) to a more extended version (Alfred's campaign against the Danes, the course of the English Civil War) to a considered overview (the implications of territorial expansion in Dark Ages Europe, the place of armed struggle in the extension of suffrage in seventeenth century England) to an historical philosphy (the rights of nationhood, the desirability of democracy) are considerable steps however and possibly not for every student - but that is true of any subject, Literature, Chemistry, music, whatever. (I apologise in advance for quoting examples from British History - it's the area with which I am most conversant - for some reason.....)
As for History being written, I believe historians would argue that History proper is
only the written form - pre-history is by extrapolation, oral history is regarded as unreliable. The value placed on oral history is comparatively recent and regarded as useful, as far as the historian is concerned, only if it can be backed up by documentary evidence. Historians love documents: documents that appear to contradict each other are grist to their mill! No historian who wishes to be taken seriously would consider making any statement without documentary evidence to validate his interpretation.
'Interpretation' is a key word. As previous posters have rightly pointed out, it isn't possible to know exactly what happened in the past: think of ten people witnessing a car crash - you would get ten different accounts and all you could be certain of was that an accident had taken place. An historian takes the existing records and offers an interpretation of events - the honest academic makes it clear this is his interpretation; the less than ingenuous (or more arrogant) writer presents his version as fact. Maybe it takes a little experience to distinguish between the thoughtful exposition and the covert manipulation of the reader, as well as the conscious effort to remember that, learned or otherwise as a paper may seem, it is of necessity a partial account, innocent or otherwise -
caveat lector.
And
Jozanny, whatever has Edward VIII (abdicated 1936, btw, just before the outbreak of WWII) done to upset you??