This video can help you for export city/area vector data simply from browser and you can easily covert it in different standard file formats in few seconds.
For exporting OSM data : https://www.openstreetmap.org/export
For visualizing & download it into geojson, csv, topojson, kml, shape file format from osm file format on map : https://geojson.io/
Please hit the subscribe & like button if you found it interesting