Chelsea won this match. But I would not say that their performance was very good. Their performance was perfect. Chelsea managed to score four goals without attacking too much. Chelsea's every attack was excellent. Chelsea is slowly improving it's true. But they have to play better if they want to fight for the title. Brighton attacked a lot in this match. Chelsea players made a total of 8 shots in this match. On the other hand, Brighton players made 16 shots. But I will say Pochettino's start is not bad. With the help of Poch, Chelsea's performance will be better next season.
Although in the end Chelsea's four goals had to be paid for by goalkeeper Kepa who also concede three goals, right 
Because I missed this match that's why I was curious about the four goals as you said and it seems you forget to explain the final score of the match, but after know the final score it turned out to be a narrow 4-3 win for Chelsea
Nothing special in my opinion because in the end Brighton also managed to score a goal in this match
Chelsea won this match that's the important thing. The Brighton side were not a weak side. We saw his brilliant performance last season at Brighton. This team was in sixth place in the points table. And they played very well throughout the season. And so Chelsea won this match, I think it's a big achievement for them. Chelsea lost both matches against Brighton last season. Chelsea were defeated by a margin of 2-1 in the home match and 4-1 in the away match. Despite a narrow 4-3 win yesterday, Chelsea's overall gameplay was very good. The team is gradually improving.