Behaviors shaped with a marker tend to generalize better (e.g. transfer better into the home) if the same marker is used consistently. A marker is key to helping the dog understand the behavior for which they are being rewarded. At home, as soon as they do what you asked, say “Yes” and then provide a treat (don’t provide a treat at the same time as you say Yes, but wait a second or so). Don’t offer a treat without saying “Yes.” The timing of the marker is important.