Do someone here know about bitcoin halving?
Most of the old bitcoin users here know about bitcoin halving. And last year many witnessed it here.
Is there a problem when bitcoin halving hits?
Yes, there's a problem but mostly it is only for the miners.
Is it better to buy bitcoin when bitcoin halving come?
It is better to buy bitcoin before it happens and don't wait before the halving comes. But last year what happened the price didn't increase rapidly.