How do I get a referral ID code?

Excuse me, could you please explain to me the process of obtaining a referral ID code? I'm a bit new to this and I'm not quite sure how it works. Is it something that is automatically assigned to me, or do I need to take specific steps to generate one? Additionally, are there any benefits or rewards associated with using a referral ID code? I'd appreciate any information you can provide on this matter. Thank you.