For nearly every Wiki, there is a Manual of Style of some form that the community uses document their expectations and standards for every article. These are usually subject to change, given how a community is also subject to the same, which is why these guidelines may change at any time. Checking back here often is typically a good idea. However, most major changes to article structure or grammatical changes will require the consensus of the community and land a spot on the Recent News bar on the Main Page namespace.