Capital: Phnom Penh

Transport: the best way to get around is by buses and minivans. You can rent motorbikes to get around the city. 

Currency: Cambodia Riel, 1000 riel = 2 hkd = 0.25 USD

Sim Card: sim cards are inexpensive and worth getting.

Handy Apps: Grab is available in the major cities, and Klook is good for booking activities and also offer private transfer.

Language: Khmer, but most people around tourist attractions speak good English.