How did Abahai expand Manchu power in Korea, Inner Mongolia, and the Amur River valley?

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Map of eastern Asia highlighting Manchuria in northeastern China, which includes the provinces of Heilongjiang, Jilin, Liaoning, and part of the Inner Mongolia Autonomous Region. The highlighted area borders Russia, Mongolia, and North Korea. — Manchuria The historical region of Manchuria shown with the boundaries of the modern-day Chinese provinces in its place as well as the portion of the Inner Mongolia Autonomous Region that is often considered part of Manchuria.

Abahai, a prominent Manchu leader, significantly expanded his influence through strategic military campaigns and administrative consolidation.1

Korea: Abahai led military expeditions into Korea, successfully forcing the country to become a vassal state of the Manchu. This relationship provided his government with essential monetary and food supplies.1
Inner Mongolia: He conducted military campaigns into Mongolia, establishing it as a vassal state. This expansion provided the Manchu with vital additional manpower and horses, which were instrumental in perfecting the Eight Banners military system.1
Amur River Valley: Through four distinct military expeditions, Abahai successfully occupied the Amur region of northern Manchuria, which had previously been under Chinese control.1

By integrating these resources and utilizing the expertise of captured Chinese advisers, Abahai strengthened the Manchu state, eventually adopting the name Qing and laying the groundwork for the conquest of the Ming dynasty.1