I have a png that I need to resize to different sizes. Would it work for me to paste it in illustrator, use its auto vectorizing tool to vectorize it, and then resize it?
Yes. Sort of. Whilst there’s all manner of tracing tools around the world, none of them are that great. So you’ll have to do some cleanup and tidying of the vector, more than likely.
Even if it’s just a circle.
They’re software guestimates. Not scientific perfection.