Please help me with this - 300 words

It is to persuade someone(make them think it’s is right ) to them understand why it is right

Ithink that the answer is a

is basically a good source of getting and others by what you know for example if someone asked a question and you know the answer you could answer it and get some points or if you need on a question you could make a post about it and wait till someone answers it or just look up the question and see if someone else has asked about it