What are the reasons for the success of the Mongol campaigns of conquest?

The reasons for the success of the Mongol campaigns are as follows: Genghis Khan was a talented commander, the main place in his ideology was occupied by the idea that he was the main khan among all peoples; the social strata of the Mongols were equal; cavalry played a decisive role in battles; a superbly organized and trained army; the use of the Mongol bow, which was a complex killing machine, its arrow pierced any armor; using a variety of tactics in battle; the large number of the Mongol army and subordination to one great khan, in whose hands were the fate of the Mongol people.