I want to get into plugin development, the only languages I know is JavaScript and node.js how would I go about learning plugin development, cheers

Hey!
Learn C# a little bit (Microsoft documentation, search for it), check the Docs on this website and make plugins!

Thanks, i was going to learn as i have my own server and it would come useful.

Another thing which can help (I very recently started coding C# just to make plugins) look at plugins which have already been made and dissect them. You can learn a lot about about how to make plugins and how to write C# in general.