For the full list of Wiki Guidelines, see Wiki: User Experience Guidelines.
(Known issue reported, to be rechecked after next Wiki platform upgrade)
General guidelines for (English-language) wiki article titles
The words you use in your article title are a very important factor in search engine discoverablity.
Brevity is key. Make the title as short as possible. Search engines key on only a certain number of characters in a title, so shorter titles are better than long ones.
Please do not include "(en-US)" in the title for English articles. See Wiki Governance: Whether or Not "(en-US)" Should be Added to the Title of English Articles.