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The results you get from Stack Exchange have to be filtered through your own knowledge to see if they're even relevant to the particular problem you're trying to solve. If you don't bring that background knowledge with you, then the answers are going to be almost completely unreliable.

Stack Overflow is a question-and-answer website for programmers. It is the flagship site of the Stack Exchange Network. It was created in 2008 by Jeff Atwood and Joel Spolsky. It features questions and answers on certain computer programming topics.

Quora is best for experience, stories and opinions. Stack Exchange is best for facts and technical things. The reason is that Quora is more permissive in terms of type of questions. Opinion-based question's are not allowed on Stack Exchange for example.

Stack Overflow is a question and answer site for professional and enthusiast programmers. It's built and run by you as part of the Stack Exchange network of Q&A sites. With your help, we're working together to build a library of detailed, high-quality answers to every question about programming.

On the revenue side of things, Stack Overflow is funded through two main sources: Stack Overflow Talent (job-finding) and advertising. Stack Overflow has now also added a Stack Overflow Teams product as well, which allows companies to clone the Q&A model for their own personal use.

Stack Exchange allows users to donate some of their reputation to help questions receive answers or better answers, as well as to incentivize users to answer. This is called a 'bounty' and can be applied on questions 48 hours after being asked, lasting for 7 days plus a grace period of 24 hours.

Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's built and run by you as part of the Stack Exchange network of Q&A sites.