Guru Govind Singh, the tenth Guru of the Sikhs, was educated and learned Persian at Anandpur Sahib. Anandpur Sahib, located in Punjab, India, was a significant place for the Guru and his followers. It was here that he established the Khalsa, a community of warrior-saints, and wrote many important religious texts. Anandpur Sahib served as a center for spiritual and intellectual growth for Guru Govind Singh and his disciples. While Lahore, Amritsar, and Patna are all significant places in Sikh history, Anandpur Sahib holds a special place as the educational and spiritual hub for the Guru. Thus, option 4 is the correct answer.