Usually /f mod <name> or /f admin <name>. It depends on the server though.
Chat with our AI personalities
It depends on the Minecraft server and what plugin the server is using for factions, sometimes typing "/help" on a server will give you the command syntax (what is required for each command). Alternatively if you know what mod they use, Google search for the plugin/mod and find out.
The only legal way to get "the real Minecraft" free is to have someone else buy it for you and give it to you.
There is no "Money" in Vanilla Minecraft (original, unmodded version). You can only "trade" with NPC villagers, give them one or two of something they want and they will give you something in exchange. If you want to give something or trade with someone then just throw it on the ground and they can then pick it up. If your on a modded server then ask one of the admins to tell you how.
Get someone to give it to you. It's not technically "free", but it's free as far as you're concerned.
no they don't give viruses