what's about stream forward logic in mediasoup

Please explain basic logic that mediasoup forward audio or video stream. Thanks.
Such as how many audio streams will forward to a client? one most active , some active audio streams or all other clients’ audio streams. And how to complete the task.

How about video stream forward? Does client decide which video streams to forward?

Sorry, this is not how things work. No free consultancy here. We write extensive documentation in https://mediasoup.org/documentation/v3/. Just read it.