I'm forever changing my mind, so I keep a copy of the original
RAW file and the edit PSD (complete, unflattened) in an 'On-going' folder.
To resize for here (AP) I create a 'Stamp visible layer' (Ctrl + Alt + Shift + E) then right click on that and choose Duplicate Layer → Document → New...(name it what ya like) that will open as a flattened image. Then resize, apply any extra
sharpening/edits then Ctrl + Alt + Shift + S to 'Save for the Web'
I'm sure there are plenty of other options as well...but that's workin' for me (until I change my mind, again

)