How does student came to know about the arrival of new questions?

Question

where does the answerer see the new questions written by a doubter?

Answer 1

I am sorry, I don't understand your question. Can you elaborate?

Answer 2

Assuming you mean "How does one find questions written by other learners? [in the forum/Q&A]"
The place where you wrote your question is called Q&A Discussions( it's shown at the top in the app & site?); where anyone can find a question.
One just goes there, possibly sorts by unanswered and/or uses the tag search feature. to find relevant questions to answer.