I think by now you already know what bitcoin halving is and I don't think there was a problem when it occurred last 2016. It is also a speculation it'll happen in 2020 because the first one occurred on 2012 then the next happened in 2016, so rumors has it it'll happen 4 years after because of the year difference. And if eve that'll happen by then, it might be a good time to buy bitcoins too.