port of call = λιμάνι (προσέγγισης) | (μτφ.) στάση

[Theseus]

First etc port of call (plural ports of call)
(nautical) The first port that a vessel calls in at after the start of a voyage:-
After leaving from Southampton, our first port of call will be Gibraltar.
(idiomatic) The first place to go to start a process.
--When you move to a new country, your first port of call is often the local police.
--I've got to go to the grocer's shop and then to the hardware shop. Two ports of call.

 

[Alexandra]

Στάση, I would say, in all these instances, except when it's literal, where I would use the word "λιμάνι".