Hello, Welcome to OpenStreetMap!  Thanks for your edits to the map, we appreciate it.  In OpenStreetMap we like to see buildings drawn with 90-degree corners (unless the building is a different shape, such as a circle - which is not the case here).  My suggestion would be to zoom in very close when editing so you can see a lot of detail, and slow down.  It is better to have a few high quality buildings, rather than a lot of low-quality buildings.  You can use the "Square" function in the iD editor to make 90-degree corners, but you have to first draw the building so that the corners are reasonably close to 90 degrees.  

Happy Mapping!