I encourage you to use JOSM for editing OSM data! The iD editor (browser-based) is a limited editor that does not allow, for example, importing objects from SHP/GeoJSON/other vector files or using useful plugins that make editing much easier and more efficient. You can also use mobile apps for quick POI edits (e.g. EveryDoor)

Useful JOSM plugins:
• fastdriveway (created by NieWnen)
• movemembership (created by NieWnen)
• plbuildings (only PL) (created by NieWnen)
• gridify
• measurement
• opendata
• PicLayer
• OpeningHoursEditor
• reverter
• terracer
• todo
• turnlanes-tagging
• turnrestrictions
• utilsplugin2

https://josm.openstreetmap.de/wiki/Plugins

Useful sites:
• https://budynki.openstreetmap.org.pl
• https://hdyc.neis-one.org/?syntex
• https://umap.openstreetmap.fr/en/

My ongoing projects (umap):
• Building outline replacement map in Warsaw Metropolitan Area (to match BDOT10k/EGiB data): http://umap.openstreetmap.fr/pl/map/wymienione-obrysy-budynkow-w-aglomeracji-warszawsk_929402
• Micromapping zone map - Poland: http://umap.openstreetmap.fr/pl/map/strefa-potozy_750318
• Added entrance=staircase with addr:flats in Warsaw: http://umap.openstreetmap.fr/pl/map/klatki-schodowe-warszawa_920924

My SotM EU Łódź 2024 presentation: https://cfp.openstreetmap.org.pl/state-of-the-map-europe-2024/talk/Q3BFCA/