[pietervdvn]

Another way to contribute is my project https://mapcomplete.org

I'm trying to build a somewhat generic map view, which features many thematic maps (e.g. shops, restaurants, bicycle pumps, toilets, ...)

Most data comes from OpenStreetMap, but it also allows to make changes, upload pictures, show wikipedia or make reviews with mangrove.Reviews

[n4r9]

Can I use this to update the location of e.g. a restaurant that is in the wrong place?

[ygra]

Yes, the point-based maps typically allow you to move a feature.