I’m not merging this with What are the differences between American, British, and Australian English accents? , but many answers there already get into this:
- Andrew Smith’s answer to What are the differences between American, British, and Australian English accents?
- Orin Hargraves’ answer to What are the differences between American, British, and Australian English accents?
- Tanay Sukumar’s answer to What are the differences between American, British, and Australian English accents?
- Anonymous’ answer to What are the differences between American, British, and Australian English accents?
- Fannana Mazumder’s answer to What are the differences between American, British, and Australian English accents?
- Paolo Lim’s answer to What are the differences between American, British, and Australian English accents?
Your safest starting point is to take What are the differences between British English and US English? , and triangulate it with What are the differences in grammar between Australian English and British English if any? (minimal), and How can you tell the difference between an Australian and an English accent? Obviously there are many regional differences, but are there any tricks to quickly differentiate? (more). We’re getting some vocabulary from American, and a little bit of spelling (though that’s more the fault of spellcheckers); but Australian English is closer to British than American English overall.