Short answers, pulled from the story.
Ustad Ali Quli was an Ottoman commander who took charge of cannon batteries during Babur's earliest conquests in India. He provided operational command over heavy field artillery units to transform the Mughal army into a gunpowder-based military machine.
Selim I dispatched Ustad Ali Quli to India by 1513 because he feared Babur might join forces with the Safavids. This diplomatic reversal occurred three years after Selim issued a direct order for Babur to accept him as rightful suzerain in 1507.
At the Battle of Panipat, Ustad Ali Quli commanded his cannon batteries with precision to secure victory by neutralizing enemy numerical superiority. His deployment covered key approaches to the battlefield while riflemen and cannons won through disciplined volleys against cavalry charges.
Ustad Ali Quli directed artillery operations against Rana Sanga's massive coalition force at the Battle of Khanwa. His cannon batteries targeted the flanks repeatedly to break the momentum of opposing infantry and establish Babur's control over northern India.
Before 1513, Indian warfare relied almost exclusively on sieges for using cannons without mobile field artillery or coordinated rifle fire. The transfer of knowledge regarding powder quality and barrel maintenance techniques changed the rhythm of combat forever in the subcontinent.