DriftingNotLost

Okay... like ... what is going on? why are my doors floating above the ground? Why won't my exterior stairs touch the ground? This must be the easiest thing possible but I have no idea what is going on. I am new to this software and I am trying to learn the best I can, so please help and please be nice. Thanks. I appreciate you all. Also, how do I design a second story deck with a covered porch where everything just makes sense. It is not intuitive in the software. Thank you.