The early goal was basically a warning to Inter (and to be fair to every other team next season as well) that you can't just slow start or just have even 10 seconds where you are not careful, this team is so good, even one possession mistake will be turned into a goal. Not every team will take advantage of your every miss, they will miss themselves as well, not this team because if you make even one mistake, they are there to turn that into a goal.
A team that is eager for goals and ready to reach such a significant milestone will not accept any opportunity to take the lead for granted. You don't do that with Manchester City; they've been aiming for this for a long time and have seen the vision that it's feasible this season, so they're not going to take anything for granted. Inter Milan should be well-prepared if they want to be considered a worthy rival to Manchester City. The match will be one-sided, but Inter can make it interesting by how they prepare for the final match.
Manchester City has been the favorite for the Champions League for the last few seasons. They spent a lot of money and built a strong team. Also the performance of this team was excellent. Even then they failed to win the Champions League title. This team is in excellent form this season as well. And compared to the previous seasons, they are playing better this year. The players are also very confident. Hopefully, luck will be with Manchester City this time. Manchester City will not make the same mistakes as in previous seasons.