No worries! Thanks for responding. I went ahead and reverted the changes. Then I edited the building to show an example of what I meant by making the same building all one area shape. A tip is look in the right side panel for "Background". There are many different layers you can pick, some of the Aerial Imagery is out of date, so verify you are using the most up-to-date one you can before you start editing.

Check out this wiki article, Its helpful for getting started:
https://wiki.openstreetmap.org/wiki/Good_practice


And here is more detail about mapping buildings:
https://wiki.openstreetmap.org/wiki/Roof_modelling

And the most important thing to remember is OSM is a mapping community, so if you need help reach out to others. But responding is really the most useful thing you can do so thanks!