Simple conjugations for the Spanish spelling change verb danzar.
Learn how to greet people in Spanish, at any time of day or night.
Learn a few gestures commonly used in Colombia (and possibly other Spanish-speaking countries). Warning: some strong language.
The distinction between tú and Ud. is one of the most confounding aspects of Spanish, and one of the most basic. The influence it has on verb conjugations and pronouns is considerable, but more than that, the choice of tú or Ud. is a matter of etiquette.