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This Beginners' Guide will show you how to add data to OpenStreetMap. Translations are available in many languages which you can select from the table at the top of this page.
You need a computer connected to the Internet and some time to gather information and then enter it. A GPS unit and connecting cable are purely optional, but will be required if you want to collect data that way. Given the excellent (but sometimes outdated!) aerial photography available in the editors these days, a GPS is less important than in the early days of the project.
In a hurry?
If you just want to edit as soon as possible, visit https://www.openstreetmap.org, zoom to an area, and click "edit". (You'll need an account first). The default editor has a built-in guide that will explain the basics. You can also click the built-in "help" button at any time.
Once you're comfortable with the map, it's recommended you come back here and learn more details.