You will need to port forward.
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Unless your server has a whitelist or a blacklist, anyone with the IP address of your server can join it
The ip to join a server.
You can join any server, no matter what type of computer you're using. If you mean do you have to have the same mods as a modded server to join, yes, you do.
First off, an online server means that the server is up and running. It is available for people to join. An offline server means that the server is down and closed for people who want to join.
It depends on the server. Some people ban you for a longer amount of time than others. Improved: When you try to join a server and it says "You have been temp-banned for (time)" You will be unbanned after that period of time. But if it says "You have been banned from this server." Your are banned for life.