A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
The pronoun "si" and derived words ("sin", "sia", "siaj", "sian", "siajn")
Questions related to languages based on or inspired by Esperanto.
when your question is also about other constructed languages.
Por demandoj pri Esperantaj organizoj. — For questions about Esperanto organizations.
UEA, la Universala Esperanto-Asocio — the Universal Esperanto Association a.k.a. World Esperanto Association
For questions about the dative case (the case used for indirect objects, in Esperanto marked with the preposition "al")