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OpenStreetMap community
Everything #OpenStreetMap related is welcome: software releases, showing of your work, questions about how to tag something, as long as it has to do with OpenStreetMap or OpenStreetMap-related software.
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Join OpenStreetMap and start mapping: https://www.openstreetmap.org/.
There are many communication channels about OSM, many organized around a certain country or region. Discover them on https://openstreetmap.community/
https://mapcomplete.org/ is an easy-to-use website to view, edit and add points (such as shops, restaurants and others)
https://learnosm.org/en/ has a lot of information for beginners too.
When you go to the OSM website, just click the edit button. You will have the option for a very nice 10 minute tutorial that shows you how to edit features, change lines (streets etc.) and drawing areas (e.g. buildings). You can try out how to change features without them being saved during the tutorial. I encourage you to try it out!
There is a very good beginner's guide in the wiki: https://wiki.openstreetmap.org/wiki/Beginners%27_guide
You can also give https://mapcomplete.osm.be a shot. It is built to allow everyone to update or add POI.