If you could know for sure, one thing about the universe, what would it be?

Literally know anything in the universe.

for me I would like to know how to go into a higher dimension. And know everything about it.
Updates:
17 d
you guys are selfish, and thinking too small.
16 d
There’s no aliens.
If you could know for sure, one thing about the universe, what would it be?
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