Answer:
The more points you gain, the higher your rank is for example, when you first start Brainly you have the rank of a beginner and as you gain more points (by answering questions and doing answering challenges) and the ranks increase.
Another use is that they allow you to ask questions. The more points you are willing to give away for a question, the more quicker people will be to answer your question and you can get your answer faster than other people who are giving away less points. The minimum amounts of points you have to give is 5 I think.
Wow I went into a lot of detail but yh lol.
