The official language of Cambodia is Khmer and 85% of the country speaks it. Many Cambodian people know English for in order to enjoy better opportunities within the tourism industry as well as in education. English often is a way to get a better paid job in Cambodia.
Fun Fact: Cambodia uses Khmer Riel and the US dollar. Often, because both currencies are used, sellers will give you change back in their home currency, but they will still accept USD. It's important to know the conversion; otherwise, you'll be so confused!
A bottle of water costs $0.25-$1.00 USD. That is 1,000 - 4,000 Cambodian Riel.
The best meal I had in Cambodia was a dessert snack called Cha Kwai. It is this soft, airy deep-fried bread with a meat filling on the inside. Many people call it a "Cambodian Empanada" because it is such a familliar taste. One of the fun things about traveling overseas is you get to see that a lot of cultures share the same combination of food items, albeit tasting and looking quite different!