With Joe Biden winning the presidential election, what kind of power does he have until Jan 20? What can he effectively do?
In this question "Has Joe Biden made any promises to revert Trump's US pullouts out of global alliances?", he said, for instance, he will recommit to the Paris Climate Agreement. Can he do that (initiate the process) before Jan 20?
Note that this question "What powers does a US president have between the end of an election and the inauguration of the next president?" is quite the opposite of this one.