I have a website where users can do practice their subjects.

Can I have a Stack Exchange website like askubuntu.com or facebook.stackoverflow.com for my website for the doubts clarification of users?

What is the process to configure such website so that when a user got a doubt in his/her subject a link will be given to post the question in the Stack Exchange website and the doubt will be clarified?

Is there any restriction for commercial websites?

I have gone through different answers related to Stack Overflow clone but the process of configuring is not clear.

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