Hi Sanika, welcome to OSM!

Please note that when mapping buildings, we typically trace the roof as an area, then move the area to align it with the building's base. Have a look at https://wiki.openstreetmap.org/wiki/Roof_modelling for a visual guide.

If you need additional help with using or editing OSM (or just wish to meet and/or work with other mappers), feel free to join us in the monthly OSM India online mapping session - https://osmcal.org/event/3930/
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