How to calculate Coinbase fees?

Hello there, could you please walk me through the process of calculating Coinbase fees? I'm a bit confused about the various factors that might influence the fee amount and how exactly I can determine what I'll be charged before making a transaction. I understand that it may vary depending on the type of transaction and the market conditions, but could you provide me with a general guideline or a step-by-step method to estimate the fees accurately? Your insights would be greatly appreciated.