Undervalued, capital growth suburbs in Sydney NSW, for property investing, where do you think?

Hi all!!

Where do you think are the suburbs that are undervalued and high capital growth suburbs in NSW, Sydney?

I only moved here a few months ago, so still learning about suburbs here.

What do you think of Rockdale, Kogarah? They are close to water, but also the airport!!
Would it be noisy there? Or do you think its wiser to stick closer to the city such as Surry hills, Darlinghurst, Newtow, Waterloo, Chippendale etc?

Thanks so much!!