How to make a public server in minecraft?

I have made a working lan server but i don't know how to make it public
explain in the easiest possible way please

Added (1). ok thanks for the help

Wolf

Your ISP will block any attempt to enable a public server on a domestic account, you need a commercial account for public or any high traffic inbound connections

Harley Drive

You have to have a commercial account so the lan server won't work and btw it does cost money to host a public server

Don