Participate on OSM & Report errors
The great idea behind Openstreetmap project is that you can edit the map yourself. You can help to make the maps better to join Openstreetmap. By improving the map in you own area you can have the latest and best map thats available, and for free! :-)
How do I participate in Openstreetmap (OSM)?
For the Dutch beginners: http://wiki.openstreetmap.org/wiki/Welkom_op_OSM
Beginners guide to OSM - This guide shows step by step how to get started with OpenStreetMap. You will learn how to set up an account, how to use map editing software, and how to go outside and collect information to put on the map
Add notes on the main map of openstreetmap.org
Errors concerning the rendering of the Openfietsmap: if you don't see the same error on the maps on openstreetmap.org it is possibly a bug in my map. Please report it to me (contact details below)
Take a look at the OSM bugs and errors database of Keepright. Here you can check why the routing is broken. In many cases roads are not connected properly.
Video tutorials about editing in Openstreetmap