New editors: Welcome to Wikipedia. We value your contributions. Please be bold while editing the free encyclopedia, but it is normal if another editor reverted your edit. Often you just made a mistake, and your contributions are not lost (you can retrieve them from the View history tab). And remember, if your edit is removed, never add it back again without discussion or a change, as this is called edit warring and would easily get you banned. If in doubt, do not hesitate to visit the teahouse to ask for help. Thank you, and enjoy your stay here.
Learn about the culture on Wikipedia: Wikipedia:Etiquette.