In the examples we have “llegar a casa”, “salgo de casa”, and there is also the expression “estoy en casa”. None of these expressions use articles. They also all use verbs of movement or location.
Do we ever use the definite article with “casa”, for example, to say “I’m going back to the house” by saying “Regreso a la casa”? Or does it change the English translation if we omit the definite article, that is, if we say “Regreso a casa” does it mean “I’m going back home”?
I know this is off topic but you use many rich examples that provoke questions.