Welcome to OpenStreetMap and thanks for mapping. 
I have reviewed and updated your some of your contrubutions.

It is recommended to add a couple more buildings before saving/uploading a changeset to avoid having only a single building in a changeset as I have done with reviewing your buildings here ==> https://www.openstreetmap.org/changeset/161039146

Also right click on the area and select "Square" to make the edges more regular/straight, take a look at one example from my review ==> https://pewu.github.io/osm-history/#/way/1348560629

Some useful getting started resources ==> https://welcome.openstreetmap.org/