Trainers should follow proper etiquette to ensure training sessions are smooth and memorable. This includes being punctual, dressing appropriately, and maintaining a respectful attitude. Trainers should greet participants, learn their names, listen without interrupting, appreciate different opinions, and remain impartial. They should also avoid jokes at participants' expense, speaking in languages not all understand, getting too close physically, and using sessions to promote products. Following these etiquette guidelines allows trainers to disseminate knowledge effectively and serve as role models.