I have come across both phrases at the start of sentences, and both apparently have the same meaning. Is there any difference between the two? Can they be used interchangeably?
closed as off-topic by Björn Friedrich, Philipp, Hubert Schölnast, help-info.de, problemofficer Nov 8 '18 at 21:17
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It means almost the same with the difference that the first version refers to something ("dabei") and the second version does not explicitly refer to something ("es" is more generic).
In English it could be translated as "This is about..." and "It is about...", so it means basically the same, but with a slightly different construction.