For over all care of the table:
After some time of use,
You can wipe the top with a damp cloth.
If the top gets gritty or dull looking, or even a scratch or nick, sand or screen the top with sand paper or fine sanding screen.
Then you can put on a fine coat of Tung Oil, you can rub it on with a old tee shirt or cloth.
For a small stain on the table, I would sand that spot, then rub on a fine coat of tung oil.
If you need any more help or information, just let me know.