Is there a fee for crypto mining?

As a financial expert in the realm of cryptocurrencies, I'm curious to delve deeper into the nuances of crypto mining. Could you elaborate on whether there's a fee associated with this process? I understand that mining cryptocurrencies involves significant computational power and resources, but are there any direct financial costs that miners must incur? If so, what are the typical fees involved, and how do they vary across different cryptocurrencies and mining methods? Additionally, are there any hidden costs or unexpected expenses that miners should be aware of? Your insights into this aspect of crypto mining would be greatly appreciated.