Help:Introduction to Redirects
A redirect is simply a way to make an article effectively appear at a number of different names, both to help people find it, and also especially to prevent the creation of duplicate articles.
To create a redirect, simply create an article (titled, say, Source) with the contents being just #Redirect[[Target]]. That's all there is to it! Any reference to 'Source' (e.g. [[Source]]) will automagically wind up at 'Target'.
We'd rather have too many redirects than too few, because the effort to create them is small, whereas the time wasted on a duplicate article can be large. So add variant names, variant capitalization, variant hyphenization and spaces - in fact, every variant, and combination thereof, which you can think of!