Before you start reading this, you should first understand what the basics of Bitcoin mining. Hence, new Bitcoins come into the world as a reward for miners whenever they mine a Bitcoin block,
Satoshi Nakamoto set up the rules for the Bitcoin protocol. he stated two important things, among othersFirst, that the supply of Bitcoin is finite and limited to 21 Million. Second, that the number of bitcoins generated per block i.e. the reward is set to decrease by 50% every 210,000 blocks.
Go to this link https://blog.kucoin.com/what-is-bitcoin-halving-procedure-and-predictions-sk-st to read the KuCoin blog titled "What Is Bitcoin Halving: Procedure And Predictions" I am pretty sure, it would help you to understand more the Bitcoin halving!!