How many ETH to run a node?

Could you please enlighten me on how many ETH are required to operate a node? I'm aware that running a node involves certain financial responsibilities, but I'm not quite sure about the specific amount of ETH involved. Would it vary depending on the type of node I'm aiming to run, or are there standard requirements? Could you also elaborate on any associated costs or responsibilities that I should be aware of? I'm eager to contribute to the Ethereum network but want to ensure I have all the necessary information before proceeding. Thank you for your assistance.