Netflix series Dark?

If someone can explain the series to me in a short text, I did not fully understand everything. Would be nice.

Best watch YouTube videos. The whole story can't be explained very well in a short text. I can't summarize everything for you either, because I do not understand everything either.

Season 1 & 2 summary:

The end explains:

(Season 3 summary)

Here is the family tree for season 1 & 2:

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And for season 3:

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The family tree explains:

Thank you!