The Full Kaddish is recited after the Shemone Esray. It includes a request that the Shemone Esray just recited should be accepted by G-d. It should be recited by the same person that led the Shemone Esray. For example, on mornings that Hallel is recited, if a different person recites Hallel than the person who recited the Shemone Esray, then the person that recited Shemone Esray would say the Full Kaddish after Hallel.
4. Be kind to yourself. Speaking badly even about yourself is unethical.
הלכות שמירת הלשון 