Hi and welcome to the OpenStreetMap Community!
Have you checked out the Beginners Guide or LearnOSM yet?
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Another welcome from me. I have moved your post to Help and Support which is the better category for your question.
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Welcome! Simply click the green “Edit” button at the top left of openstreetmap.org, complete the walkthrough and start editing. Make sure to do some research on the wiki if you have any doubts. Don’t hesitate to ask any question on the forum.
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