Above all else, Wikipedia is an encyclopedia. This means that by its very nature, items in Wikipedia have to be notable enough to be considered encyclopedic.
A topic is notable if it has been the subject of multiple, non-trivial published works from sources that are reliable and independent of the subject itself and of each other. All topics must meet a minimum threshold of notability in order for an article on that topic to be included in Wikipedia. This requirement ensures that there exists enough source material to write a verifiable, encyclopedic article about the topic.
What Wikipedia is not: In addition to the notability criteria described above, the entry must also be encyclopedic in nature. Items such as FAQs, video game guides, memorials, instruction manuals, directories, lists of links, advertising, self-promotion, and dictionary definitions are not encyclopedic.
Does your proposed article meet the notability requirements?
My proposed article is about a notable and encyclopedic subject
My proposed article is about a subject that may not be notable (what can I do?)