How do I transfer my Crypto to Coinbase?

Could you please provide a step-by-step guide on how to effectively transfer my cryptocurrency holdings to Coinbase? I'm a bit new to this process and would appreciate the clarity in explaining the necessary actions. Specifically, I'm wondering about the initial setup required, including verifying my account and adding the necessary wallet addresses. Also, I'd like to know about any potential fees involved in the transfer and how long it typically takes for the funds to arrive in my Coinbase account. Additionally, are there any security measures I should take to ensure a safe and secure transfer?