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By plane:

two international airports
(direct flight connection to 250 cities):
Chopin Airport (10 km from the City Center) and Modlin Airport (35 km from the City Center)

https://www.warsaw-airport.com/
https://modlinairport.pl/
By car:

from Berlin (via A2 highway), Dresden (A4+A1), Prague (A1) or Lviv (A2+A1). Please mind the speed limits :)
By train:

Three stations with direct connections to Berlin, Bratislava, Prague, Vienna, Budapest and Kiev!

https://www.intercity.pl/en/
By bus:

International bus terminal with direct connections to various European cities including London, Paris, Berlin, etc…

https://dworzeconline.pl/