I don't understand volumes, how to understand this example?

Question

Docker

There is an example:

volumes: 
     - /data/certs:/etc/nginx/certs

And then I understand that the /data/certs/ folder on my server refers to /etc/nginx/certs in the container?
Those. if I change some data in my /data/certs/, will they be automatically pulled into the container along the path /etc/nginx/certs?

Answer 1

No, they won't pull themselves up, they will be them.
If something in the container accesses /etc/nginx/certs it should be in /data/certs