bitcoin node take transactions fee and validate them a bitcoin node check transactions and validate them . does it take transaction s fee. when validate transactions how much bitcoin transaction fees for a node.and possible reduce fees in a bitcoin node
Transaction fees are paid to the miner that includes that transaction in their block. Nodes do not earn transaction fees (or any other fees) for validating transactions.
You can reduce fees by using segwit inputs, and by waiting for periods when the mempool is relatively empty.