By my understanding (and the Area 51 FAQ), StackExchange sites are meant to be host to "experts" posting "expert-level" questions. However, we've seen a number of questions asked and answered (and up-voted), which are quite definitely basic-level topics.
With my apologies for D&D4e-centricity in this list (it's all I know) here's some examples:
- Can I move and shift as a single move action in D&D 4E?
- What is the best way to determine Overland Speed in D&D4e?
- Do creatures occupy cubic space, or are larger creatures still one square tall?
- Does teleportation require line of sight?
- Can a blind creature teleport another?
- Is there a high limit on how high the Tenser's Floating Disk will fly?
These questions each represent one of a few things, to an experienced D&D4e player:
- Something they should by now have inherent knowledge of.
- Something which is unambiguously addressed in a single rule.
- Something which can be quickly found by a single lookup in a rulebook or online resource that an experienced D&D4e player would likely have access to.
In short, I feel like any question that can be unambiguously answered by checking one page or one entry in either the PHB, DMG, Essentials Rules Compendium, or D&DI Compendium, is not something which is "expert level" for our environment.
On the other hand, we do have a good and large base of more in-depth and complex questions on a variety of topics here.
Still, to stay within the spirit of SE, should we be discouraging simple questions about the bare basics?