How can ı Point domain and subdomain 2 or more different docker container ?

Hello, I’m pretty new to this stuff. First of all, I installed docker and nginx on my server. I then used the docker image file located in the nextjs-example folder.Here is example I cloned my project via github and raised it via docker.

Now I want to do something like this. When I log into mydomain.dev it says “This site cannot be reached”. but when I type the ip address of the server into the browser, the project works.

How can I point this to my domain address?

In addition, I want to create a few subdomains. For example project1.mydomain.dev project2.mydomain.dev These will be projects working with different docker image files, how can I integrate them into subdomains.