Is there any Stack Exchange site where I can ask questions about computer networking project ideas?
There generally aren't any Stack Exchange communities which serve to help people develop their ideas. (Though I could be wrong, there are more and more sites being created these days.)
Stack Exchange's question and answer format is geared more toward the implementation, not the idea. There are certainly a number of less concrete questions on Stack Overflow, and even more on Programmers, but the focus remains pretty clear. These sites are about solving discrete problems, not discussing ideas.
For example, if your question was:
I have an idea for a computer network project. It's for creating a way to connect computers together in a peer-to-peer manner instead of through a server. It'll be like the next Facebook, but for computers! Can anybody tell me where to get started?
Then your question would be closed. It doesn't belong on any Stack Exchange site (that I know of).
However, if your questions was:
I've been implementing this network project, and I'm stuck on something. I'm trying to accomplish [add details here] and I started by [add details here]. However, when I get to the point that I need to [add details here] I can't seem to get around [add details about an observed problem here]. I thought I'd be able to [add details here], but [add details here] is getting in the way. Does anybody have any insight on this? Maybe I'm going about it the wrong way?
Then your question would be a better fit.
Notice the main difference is in the amount of work you put into the question. Open-ended discussions don't make for good questions on Stack Exchange. But discrete reproducible problems with specific parameters make for great questions.
A few things that should go into any given question in most cases:
- What you're trying to accomplish.
- Why you're trying to accomplish it (maybe the answer requires taking a step back and approaching the overall goal differently).
- How you're trying to accomplish it.
- A problem you've encountered.
- How you've attempted to diagnose the problem (information from your debugger, steps taken to test it, etc.).
- Expected behavior vs. observed behavior.
You can see where this is going. The more details you present, the more help can be provided. It's especially helpful to give a complete example to reproduce the issue. For example, with code, don't just post all of your code. Remove anything unrelated to the problem. Reproduce the problem with as little code as possible. (In most cases this process will reveal the answer to you before you even post the question.)
This isn't to say more open-ended and subjective Stack Exchange sites don't exist. The English Language and Usage site, the Parenting site, etc. are all much more subjective in the questions and answers they accept. So, for any given site, you'll definitely want to check the FAQ and browse some example questions before proceeding. But for the technical sites (Stack Overflow, Server Fault, Super User, etc.) the format is generally much more concrete.
Your question is vague, but I'll try and point you in the right direction.
If you mean network programming, I would look at Stack Overflow.
If you're looking into networking because of a game (like Minecraft networking or something like that...), check out Game Development.
You asked for a website that didn't need to be from Stack Exchange, so here is an amazing tutorial on networking.