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.
thank you,