Does Allah have limitations? Is it shirk/kuffr?

Aslam mualykom , Does Allah have limitations? As Allah is the greatest, we understand that there is none greater but does this mean that there is nothing outside of his ability? For example: Can Allah take any created thing out of the creation with out destroying it or uncreating it?? Or can Allah create another Allah (Allah is uncreated)? Or can Allah go against the Quran? This is a thought that was presented to me, if I were to believe that there limitations to Allah's ablity as mentioned above would this be considered shirk or kuffr? Shukran