Possible meanings are that this "angel" is 1) a heavenly angels who protect this church or 2) a human messenger to the church, either a messenger who went from John to the church or the leader of the churches. See how you translated "angel" in [Revelation 1:20](../01/20.md)
This is the name of a city in the western part of Asia that today is modern Turkey. See how you translated this in [Revelation 1:11](../01/11.md). (See: [[rc://en/ta/man/translate/translate-names]])
Jesus speaks of his authority to decide who may go into his kingdom as if it were King David's key. (See: [[rc://en/ta/man/translate/writing-symlanguage]])