I have a 5X3 Oak kitchen table that I want to refinish. Currently it has
some kind of varnish or polyurathane finish (not sure how to tell the diff)
that has partially worn off in spots.

What's the best way to do this? Can I just sand the old stuff off?

What is a good finish for oak? I finished a pine table that I bought
new/unfinished with some kind of oil - mink oil, if I remember right.
Would this work for oak?

Thanks,

Larry