How would there be a difference between a MAME game strategy and ARCADE, considering that MAME is emulation of ARCADE games? I don't get it.
There isn't. Any arcade game that MAME emulates appears in both categories. Any arcade game that MAME does not (yet) emulate will only appear in the Arcade category. That's all. So if you click on the link for, say, Ms. Pac-Man in the Arcade category, it will take you to the exact same page as the Ms. Pac-Man link in the MAME category (or in any other category for that matter, we usually only have one guide per game title, but there are rare exceptions).
But besides that, I'd like to a strategy. How do I do that?
Er... I'm sorry RayB, I'm not sure what you were trying to ask. If you were asking how to contribute, you simply head to StrategyWiki.org and create an account, and start editing. StrategyWiki is a wiki site, just like Wikipedia. The articles are open to everyone to edit and contribute to. It's like GameFAQs, only instead of having a bunch of disparate guides, we have just one guide that everyone works on. And we have pictures.
![Grin ;D](http://newforum.arcadecontrols.com/Smileys/default/grin.gif)