Love of Prophet

Dear scholars, As-Salaam `Alaykum. Why do we only address the last Prophet Muhammad, peace and blessings be upon him, as the "Holy Prophet" but not other Prophets? Weren't other Prophets like Isa, M usa, and Nuh, etc. Holy? Also is it true that Allah made this world because of Muhammad, peace and blessings be upon him? Jazakum Allah khayran.

Dear scholars, As-Salamu `alaykum! Please enlighten me on how should we show respect to our beloved Prophet Muhammad (peace and blessings be upon him).

Dear scholars, As-Salamu `alaykum. How do I strengthen my love for the Prophet (peace and blessings be upon him)? Jazakum Allah khay ran.

Respected scholars, as-salamu `alaykum. Did the sahabah (Prophet's Companions) or the tabi`un (Successors) have the habit of commemorating the Prophet's birthday? If not, how can we legalize this today?Jazakum Allahu khayran.