The Bitcoin halving is a big event that happens every four years. It's when the amount of Bitcoin that miners get for verifying transactions is cut in half.
Miners do tasks to find Bitcoin blocks and confirm transactions for Bitcoin users who make on-chain transactions and have to wait confirmations from miners.
By finding new Bitcoin blocks, miners will receive block rewards that are affected by Bitcoin halvings. This part of Bitcoin miners will be halved after a Bitcoin halving.
By confirming Bitcoin transactions that are broadcasted by senders and have to wait for miner confirmation, miners will get transaction fees that paid in satoshi/ bitcoin and I am sure it is not affected by Bitcoin halving.