Stack Exchange is an application aimed to resolve doubts for those users who have mostly technical questions (networks, operating systems, hardware, Wordpress, etc.), and want to find answers to them. Of course the app also works for those who would like to share what they know and help answer those questions.
You can check all the questions in every category without having to open an account in Stack Exchange, but you need one to ask questions or answer them. Still, creating an account is simple and completely free.
Categories in Stack Exchange, even though most of them are focused on informatics, are pretty varied. You can find forums dedicated exclusively to photography, writing, video games, and even cooking. And of course you can find others dedicated to Android, hardware, and web applications.
Stack Exchange is an interesting application for users that are really knowledgeable on a certain topic, because it lets them share it with users that are looking to learn about it, and it's really helpful for these as well.
