What is Stack Overflow ?
The place where every programmer loves to visit whenever he need some help is Stack Overflow.
Stack Overflow is the largest, most trusted community for developers to learn, share their knowledge, and build their careers.
According to Stack Overflow research, more than 50 million professional and aspiring programmers visit Stack Overflow each month to help, solve coding problems, develop new skills, and find job opportunities.
How it Works ?
Now you might be thinking that if that many programmers visits there for their problems then who is there to help them. As i said that Stack Overflow is a programmers community means they(programmers) helps each other according to their level of knowledge.
How to find Best among all answers ?
There is a voting system that allows you to vote the answers written by programmers. If you found an answer well explained then you can upvote that answer and if not then you can downvote.
This voting system helps other programmers to find out best answer among all the answers of a particular question.
Job Opportunities !
Yes, they provide jobs. Many companies post their jobs on Stack Overflow and provides an opportunity to freelancers to get job.
You can check out for jobs that matches your skills and can apply for them.