What would be the best Stack Exchange website to ask questions about patents? For example, the best way to patent a given idea in the artistic / creation field.
Probably in your patent lawyer's office. There is patents.stackexchange.com, but that isn't a patent law advice site.
There's the Patents Stack Exchange site.
However, it states it's:
So I don't think that your question about the best way to patent something would necessarily be on topic.
As a general rule if you are asking for "the best X" then your question is highly likely to get closed as not constructive (at best) on any site in the network.