This is the 845th most frequent Chinese word.
出发
To set off or depart.
In this sentence, "出发" is used as a verb meaning 'to set out' or 'to start traveling for a destination'.
我们明早七点出发去机场。
Tomorrow morning at 7:00, we will set out for the airport.
Here, "出发" is used metaphorically, meaning 'starting from' or 'taking into account a certain perspective'.
从这次旅行的角度出发，体会了生活的多样性。
Starting from the perspective of this journey, we experienced life's diversity.
In this usage, "出发" implies 'based on' or 'taking inspiration from' a source or factor supporting his creation.