"Conspiracy theories love a vacuum. And Building 7 is a major focus precisely because initially there wasn't as much evidence and there wasn't as much known about what happened with Building 7..."
The first half is a good introduction, but if you're versed in the issue, skip to 4:00. It does a very good job of addressing each theory.
Your concerns about "how" it fell are addressed quite well; after 6:02 and beyond, especially.
I have yet to find
credible evidence which demonstrates a strong contradiction with the information in this video.