Flight
Salzburg has a small airport that has flights coming to & from most major European cities. If you're flying in from China or the U.S., the best way would be to transfer via Frankfurt/London.
Train
If you're coming from continental Europe, train is a very convenient way to travel. Salzburg is only a 2.5hr train ride from Vienna.
Travel Note
We've found Salzburg to be relatively easy to navigate by taxis or Uber. If you prefer to rent a car, there are also agencies (Avis, Hertz, etc.) around the main Train station. Renting a bicycle or simply walking around may also be great options. Feel free to check out the below Lonely Planet link for options on navigating Salzburg.
Hotel
The location of our wedding is also a hotel itself (it's a historical landmark where the Sound of Music was filmed!). However, the hotel's capacity is very small. We would suggest either booking an Airbnb or hotel next by.