Hey, welcome to the thread
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As for the acronyms:
VO = Visa office, where your PR application is processed.
AOR = Acknowledgment of Receipt, a letter you'll eventually receive from your visa office (if applying outland) letting you know they have your file and giving you your immigration file number.
PPR = Passport Request. This is when the visa office requests your passport. For most offices, it isn't requested until the tail end of processing, when they're ready to issue you your PR visa. But some offices ask for the passport early, before a decision is even made.