For a beginner, how many ahadith do you recommended memorizing a day, and what Hadith book do we start with, and which book after that? And so on. جزاك الله خيرا

Start with the forty of al-Nawawi, then Umdat al-Ahkam, then Bulugh al-Maram, which is the order Imam Ibn Baz gave. No daily number is fixed, so take a small portion you can hold and never stop, even if it is two a day.