1. The maximum number of persons in a tapas tour is six. More it´s too much.
  2. Tapas should be taken standing at the bar top.
  3. Don’t eat more than two tapas at any one place. The idea is to eat a little and move on to the next bar.
  4. Practice what the Sevillians call “convidá” (convidada means invitation)… whereby everybody pays for a round.
  5. When you go for tapas you shouldn’t have unpleasant conversations. Go for tapas is a way to having fun.
  6. Learn to combine the right tapas and try to each of each group of foods. Try with vegetables, meats and fish.
  7. If you’re not sure what something is, just ask. The Spaniards take great pride in the creativity of their tapas, and will be happy to share it with you.
  8. Make it clear if it’s a “tapa” you’ve order (mini portion) or a “ración” (a meal sized serving) or you’ll end up paying more than you expected.
  9. The traditional drink with the tapa is beer or wine. All around Spain you will have nice wines (ask the waiter). Is a good opportunity to try different types of wine, one with each tapa.

Information sources:

www.atapear.com
www.sevilla.abc.es
https://es.wikipedia.org
And myself experience 😉