Exactly the most important thing is to have the winning mentality and always be with the head to victory, I understand that not everyone can have this head and understand that they can identify with the victory, the PSG had more stubbornness and immediately tried to win by crushing Inter immediately.
We will witness how those teams perform in the group stage, whether they succeed or not. The points tally might be tight, but there may also be underdog teams that can provide surprises by taking advantage of their matches against strong teams from the start.
Inter and PSG are strong teams that defeated many other competing teams last season. I hope both can perform well in the group stage.