I've been having issues with the fact I can't download any allowed mods due to they aren't updated to 1.13.2. They only come in 1.12 or 1.12.2. So could you please either tell me how i can download a 1.12 mod into 1.13.2 or just make the server compatible with 1.12? Please and thank you.

So I'm quite new and I'd like to know what the commands are, what they are for, where places are, etc. If you could help that would be great and yes I read the rules.