AEK won the Greek championship and OFI won the Greek Cup
That means AEK will be in the Champions League playoffs while OFI will be in the Europa League playoffs.
The second place team which PAOK and Olympiakos are fighting for, are going the second qualifying round of the Champions League, third place will be the Europa League second qualifying round. Panathinaikos finished 4th place and will play the second qualifying round of the Conference League.
Here is the interest part:
In the group where OFI, Levediakos, Aris, and Volos are playing, the winner of that group also go to the Conference League?