Everyone, of course, has their own views on the world, but it is obvious to me that history is regularly rewritten and distorted, and the world one, and not a separate state.
This concerns not just any decisions of states in terms of politics, global, etc., but in general world development, which in the past has been greatly underestimated.
So, let's imagine that we know the true history, that for example, 3000 years ago there was a highly developed civilization that possessed certain technologies, capabilities in various areas of life and science, etc.
Many answers already follow from this question, which will give this knowledge of the true history. At a minimum, these are even partial understandings of ancient high technologies, advances in science, etc.
In addition, it seems to me that it is most important to know all the catastrophes of the past, which, based on the true history, in fact never happened, although this is practically impossible.
Nature is unpredictable and for millennia there should have been global floods, possibly giant volcanic eruptions, etc., it is possible to enumerate the dangers of nature for a long time.
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One way or another, any references from the past would give humanity an understanding of how to prevent this, at least try. Although humanity itself destroys civilization, therefore, in this case, it is difficult to reason about something until people in the world understand that all this leads to only one thing.
I often write in articles that humanity would be much more developed if knowledge, scientists and states were fully united, but politics and power, apparently, will always be more important than development, on the basis of which any civilization is doomed, it's only a matter of time.
This is if that is my subjective reasoning, although it seems to me they are more than logical. If we return to the topic itself, then, as I said, one of the most important is to find out the problems that contributed to the destruction of past civilizations.
But apart from this, knowledge and technology would give a lot. Since no matter how many “experts” there are, the fact remains that many of the proven capabilities of the ancients are now inaccessible to us.
This also applies to construction with the processing of any material, and let's say the transportation of megaliths, some of which are currently unavailable, simply because there is no technology in the world and even approximate possibilities.
By the way, the change in the level of architecture for 400-500 years is also worth mentioning, since the fact is quite weighty. Although many explain the contrast in the level of architecture supposedly by the simplification of technologies and materials in our time, but this is illogical.
In general, to summarize, then a true story with a detailed study of every artifact, structure and any find of the past would make a huge contribution to the development of the entire civilization.
To be honest, I am a little surprised by people who, in principle, do not deny the fact of distortion of history, but believe that this will not change anything in any case, even if everyone knew the truth, proven by facts.