WTC7 seems to be a classic controlled demolition. WTC 1 &2 destruction appears to have been enhanced by thermate (a variation of thermite) in addition.
Pentagon was not struck by a passenger aircraft. It was a drone or missle.
If you want to be a "History Detective", an Expert in 911 studies, it is prioritary for you to do a careful analysis of the original sources to slowly track the 911 skies. You may want to see every documentary and newscast containing original footage of 911 portraying its sky.
Apart of the original newscasts of the day, we, for example suggest the next documentaries that show the 911 sky (of course, there are more):