question #1 Sahih Muslim 976b, Book 11, Hadith 135 : What is the significance of visiting graves in Islam and how does it relate to mindfulness of death?

The Apostle of Allah (ﷺ) visited the grave of his mother and he wept, and moved others around him to tears, and said: I sought permission from my Lord to beg forgiveness for her but it was not granted to me, and I sought permission to visit her grave and it was granted to me so visit the graves, for that makes you mindful of death.