How do I make a stackoverflow board?

How can I make a stackoverflow board?

I'm new to coding. html css is simple enough. I have been learning for about a month. I am a Korean pharmacist. I want to help the professions by creating a website that incorporates the many features of stackoverflow. Specifically, I want to make a bulletin board that reflects the tag function and reputation function provided in stackoverflow. What should I do? Is there a related solution?

I would really appreciate it if you could help me. Thank you.