To make it easier for you to get answers, you should separate each of your questions by giving a number or list for each question and in my opinion this seem clearer and better. Example:

• Can you can tell me how does this forum works ?
• How does it pay people ?
• How much it pay as we know we can learn and earn from this forum ?

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Although many users have tried to answer your question, but I just want to give a little extra for you based on the knowledge I have.

• As we all know, this forum is a repository of knowledge related to bitcoin, blokchain, and other knowledge related to it. Every forum has rules that must be obeyed by each member "no need to say it again because you can read many thread references about the rules". You will probably find unofficial rules and also official rules here after you have successfully read it and this forum is democratic in other words, you have freedom of opinion and talk whether anyone wants to respond or not. This forum is where you contribute and this forum will be useful for you if you can make it a source of knowledge about bitcoin and that's how this forum actually works.
• The company, the site will pay participant involved in the campaign or bounty if you are one of their participants. To send or receive bitcoin, you must have a bitcoin wallet and you must have a balance if you want to send it to another wallet.
• Depending on the wishes of the company and also the managers consideration "even though it is not mandatory".