Did Genghis kahn make mistakes?
Of course he did. Everyone makes mistakes.
No, Tamerlane (Temur Lang, meaning Temur the Lame) lived several generations later than Genghis Kahn. Genghis Kahn died in 1227, Temur in 1405. Genghis Kahn was a Mongol, born in Mongolia, while Temur was a Turk (quite possibly with some Mongol blood), from the area that is now Uzbekistan. He made Samarkand his capital. His empire was neither as large nor as enduring as that of Genghis Kahn.
Genghis Khan achieved immortality eversince he became his empire's local stronggman, he gained power and lead his empire and he wanted to achieve immortality so he can have the ability to live forever, or eternal life. That's all I know, I hope it might help you a little during your research or whatever.
Yes!! Everybody makes mistakes. It is something we just can't resist. We don't know we have made a mistake but we just do. You, I and everybody else, we all make mistakes. It's very common to make mistakes. You can learn from your mistakes and you will probably will never make the same mistake again.