Biographical information on Guru Nanak is available from which major source?

• The Janam sakhis are legendary biographies of Guru Nanak.
• Guru Nanak was the founder of Sikhism.
• Between 50 and 80 years after his death, The first Janamsakhis were composed.
• In the 17th and 18th centuries, Many more were written.
• The largest one, Guru Nanak Prakash was written in the early 19th century with about 9700 verses.
• Into the modern era, The 4 Janamsakhis that have survived include the Miharban, Bala, Adi, and Puratan versions.

Additional Information

• Adi Granth, the sacred scripture of Sikhism, compiled by Guru Arjan Dev Ji and later expanded into the Guru Granth Sahib.It is a collection of nearly 6,000 hymns of the Sikh Gurus (religious leaders).
• Gyan Ratnavali is a work that's an expansion of the first of Bhai Gurdas's Vaars, which is a historical source of Sikh practices, beliefs, and history. Bhai Mani Singh expanded the first of Bhai Gurdas's Vaars into the Gyan Ratnavali.The Gyan Ratnavali is a life of Guru Nanak.
• The Dasam Granth is a collection of various poetic compositions attributed to Guru Gobind Singh.