Q 1: I memorized the entire Qur'an when I was nine years old. I learned it with Tajwid (reciting the Qur'an following the rules of recitation) and studied its rulings and continued to recite and revise it regularly. Then,
after a long period of negligence, I forgot many portions of it.
Allah blessed me with a job here and I was able to perform Hajj. Upon my return, I started memorizing the Qur'an again. All praise be to Allah, I am about to finish memorizing half of the Qur'an with Tajwid. Will I incur a sin for the period during which I was negligent of the Qur'an?
If the reality is as you mentioned, there is no sin on you.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.