How do I refinish a round wooden top dining table?

You can use a chemical stripper to remove the old finish. Citristrip is a good one. An orbital sander will also take off the old finish. Use a heavier grit sandpaper to remove it and finish with 220 grit. Apply your new finish (stain?) to the bare wood. I recommend polyurethane for a durable topcoat on the table.

https://www.hometalk.com/diy/kitchen-dining/kitchen-dining-furniture/before-and-after-painted-dining-table-top-to-refinished-natural-wood-3362745

https://www.hometalk.com/diy/paint/furniture/5-steps-to-refinish-a-table-top-or-desk-2484586

https://www.hometalk.com/diy/kitchen-dining/kitchen-dining-furniture/how-to-chalk-paint-a-table-top-to-last-43461278

https://www.hometalk.com/diy/paint/furniture/table-top-trouble-makeover-24838046

https://www.hometalk.com/diy/clean/furniture/refinishing-a-table-top-the-easy-way-15839043

Hi the easiest way would be to use chalk paint and a sealing wax . No stripping , no sanding or primer needed !!!

When I refinished my wooden dining table top, I stripped with a mild stripper and scraped existing top coat. Then cleaned with denatured alcohol. I liked the color so I then added 3 coats of poly to seal and give a hard finish. If you want to change the color, you will need to sand until there is no stain. Then clean, stain, and seal.