How much is BTC per transaction?

Excuse me, I have a question about the cost of Bitcoin transactions. Could you please tell me how much does it cost to send or receive BTC in a single transaction? I'm new to this cryptocurrency world and I'm trying to understand the associated fees. Is there a fixed fee or does it vary based on the amount being transferred? Also, are there any hidden costs that I should be aware of? I'd appreciate any clarity you can provide on this matter.