Phurbutsering
Hello, and welcome to Wikivoyage.
To help get you started contributing, we've created a tips for new contributors page, full of helpful links about policies and guidelines and style as well as some important information on copyleft and basic stuff like how to edit a page.
Please also look at what is an article. Your embryonic Lhasa article - actually, just a photo from Commons - has been redirected to Lhasa. The Potala is an attraction in Lhasa, and attractions very rarely get their own article on this site, and then only when they are far from cities, which is not the case with the Potala.
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All the best,