hi, be careful when mapping not destroy existing features. Use correct tags, since you are using JOSM, pressing F3 should help you find presets easily. "road=yes" is not a valid tag. You connected two parallel roads, fixed now. See map features for common OSM tags https://wiki.openstreetmap.org/wiki/Map_features

When mapping building with holes/inner openings, use multi-polygons.

here is a resource for getting started with JOSM https://learnosm.org/de/josm/start-josm/