Australia: primary language is English — English is spoken virtually everywhere.
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The primary language in Australia is English.
English is spoken virtually everywhere. English is the native language — no language barrier to plan for at all.
Learning "hello," "please," "thank you," "excuse me," and "the check please" in the local language goes a long way anywhere, including Australia — locals consistently appreciate the effort.
It's rarely necessary given how widely English is understood in Australia, but it doesn't hurt to have one as a backup.