Where the verses of QURAN written?

Answer 1

i got this from wikpedia

that the Quran was memorized, recited and written down by Muhammad's

companions, called Sahabas, after every revelation dictated by Muhammad. Most of Muhammad's tens of thousands of companions learned the Quran by heart and recited it repeatedly in front of Muhammad and/or his companions for approval.

Shortly after Muhammad's death The Quran was compiled into a single book by order of the first Caliph Abu Bakr and at the suggestion of his future successor Umar. Hafsa, who was Muhammad's widow and Umar's daughter, was entrusted with that Quran text after the second Caliph Umar died. When Uthman, the third Caliph, began to notice slight differences in Arabic dialect he asked Hafsa to allow him to use the text in her possession to be set as the standard dialect, the Quraish dialect now known as Fus'ha(Modern Standard Arabic). Before returning the text to Hafsa Uthman made several thousand copies of Abu Bakr's redaction and, to standardize the text, invalidated all other versions of the Quran. This process of formalization is known as the "Uthmanic recension".[14] The present form of the Quran text is accepted by most scholars as the original version compiled by Abu Bakr.[14][15]