Sure thing.
On OpenStreetMap (OSM) there are four main things you can do.
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Mapping: Trace features like roads, buildings, waterways, and land use from satellite imagery
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Editing: Update existing map data to reflect changes, such as new roads or buildings.
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Validation: Check and correct errors in the map data to ensure accuracy and completeness.
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Tagging: Add detailed information to map features, such as names, types, and other attributes.
All of these can be achieved via OSM’s web app.
Here is the Beginners’ guide if you want more info.
I’d be willing to answer your questions if you had any. And I’m sure others that map edit for OSM would be willing to do the same.
To verify, yes.
It’s against Google Maps’ ToS (Terms of Service) however to use its exact coordinates for anything outside of Google Maps. This is mostly to prevent others from using exact information (map or otherwise,) and then compete against them.