Most of the people that started bitcoin last year know about halving. Most of us here witnessed the halving that happened last year.


The difficulty for the block reward increases. To know more about it  : https://en.bitcoin.it/wiki/Controlled_supply

Yes, probably before the halving happens, you should buy as the result of it the price increases.

Here is the schedule of the next halving : http://www.thehalvening.com/#1