Why were the Mongols able to conquer Asia?

this may not be the most detailed answer, but it's better than the previous one, which wasn't even an answer.

very simply: Central Asia was tightly centralized while the Mongols were not. they did not have an actual capital and were constantly moving around because of their nomadic lifestyle. the central asians had to protect their land while the mongols had nothing to protect but themselves. this made it easier for them to move their camps and lay more waste to their enemies.