20yo, $1000 to invest in a single stock, looking for input on my shortlist

I'm 20 and have js started investing, and already invest long term through ETFs, but I want to put $1000 AUD into one individual stock to start learning how to actually evaluate companies rather than just buying the index.

I'm looking at a few options and trying to narrow it down. I'm leaning towards sectors like tech open to others too.

What would you look at first when comparing a few candidates like this? Is there a framework you'd use to decide between them, or red flags that would rule one out straight away?