I am not able to find a place where I can ask questions regarding cameras and photography. On which Stack Exchange site can I post my questions regarding cameras and photography?
Photography SE sounds like your best bet:
As Rory said, Photography.SE sounds like the best bet. That said, before posting your question there, you should take a look at the existing posts and FAQ to make sure that you are indeed on the right site.
You say your question is about photography and cameras but if your question is
Then you might want to reconsider posting it.
Reading the faq is a must but even more important is to gauge the site and its community, see how they operate and only jump in when you are confident that you are posting an on topic and constrictive question that has the possibility to help future visitors.
As a side note you'll be able to find a list of Stack Exchange sites on the Stack Exchange website -
There's also some links in the footers of all SE sites...