How can I exchange my coins?

Excuse me, could you please elaborate on the process of exchanging my coins? I'm a bit new to this and would appreciate a step-by-step guide. Is there a specific platform or exchange that you recommend for this purpose? Additionally, are there any fees associated with the exchange, and how do I ensure that my transaction is secure and protected? I'd also like to know if there are any limitations or restrictions I should be aware of before proceeding with the exchange. Thank you for your time and assistance.