What are the proper commands for lying down, sitting, etc.?
Your dog does not know English, so there is no one “right” command for any particular behavior. What is important is that your use cues consistently so as not to confuse your dog. At the Canine Connection you can call the behaviors by whatever name you like (e.g. some will say “stay” while others prefer “wait”), we just want to be sure you do so consistently.