I read about black-box testing on wikipedia.
I would love to try to learn Black-Box testing techniques but the problem is that I can not find any site that provides Black-Box examples.
Is there a site that does this? Perhaps websites like (only with Black-Boxes)?
Thank you in advance.
As you probably learned, BlackBox testing is a technique that you can apply to anything, not just software.
From your question, it looks like you are looking for real-life examples where you can see this technique in action. I recommend continuing your research and googling more examples, such as here, or here.
The best way to get a grasp of this technique is to use it on software you have wrote yourself! (just pretend to be testing from an outsider's perspective)