How do I verify my Bitcoin account?

I'm a bit confused about the process of verifying my Bitcoin account. Could you please walk me through the steps in a clear and concise manner? Specifically, I'm interested in understanding what documents or information I might need to provide, as well as any specific actions I should take on the Bitcoin platform or wallet to complete the verification process. Additionally, I'm wondering if there are any fees associated with account verification, and if so, what are they? Thank you for your assistance in clarifying this process.