Port forwarding in Docker?

Question

linux

Good afternoon!
I just started working with Docker and I have the following question:
Can I run a container like this:
docker run -d -p 3301:80 img1
As far as I understand, this is how I forward port 3301 to port 80 in the container. Does this mean that everything sent to port 80 inside the container will end up on port 3301 outside the container? That is, the ports are prokinut in both directions?

If not, then how can you port the port from the container to the outside?

Answer 1

No. You will leave as usual. This is the forwarding of incoming traffic from the main interface to the Docker network.