So, what's wrong with wikipedia?
Yes, there is an astronomy portal there but wikipedia does not allow how-to guides and other practical information to be added. This is fine for people who just want to read about astronomy but for us amateur astronomers it's not very useful.
|If you are new to amateur astronomy, you might want to go trough the Getting started page first.|
Want to contribute?
You're more than welcome to do so! Currently there aren't any strict guidelines set in stone, but due to the nature of this industry please keep everything brand neutral. Other than that it's best to keep everything understandable to newcomers. You can also search for photographs and such that are copyright free (or even take some photo's yourself) of the relevant gear/object/whatever and add them to new and/or existing articles.