Hello,
I wish there would be a nicer way to welcome you here but I must inform you that some of the edits you have been doing in the last hours are incorrect, and in most case even harmful for routing.
We had to redo some of your changes and even undo some of them.
Drawing sidewalks is not necessary in OSM.  For those who want to do this, it requires some experience with routing, to avoid common pitfalls like here.  Also, we discourage people from tracing in the iD online editor.
Can I please encourage you to spend a little more time learning about OSM or doing smaller contributions before engaging in sidewalk mapping in dense areas?
Thanks and have a nice day.