So, I had wanted to create a mining system and downloaded a plugin for that goal. Naturally, I got lost in the jargon. I'm assuming most of the "plugin code, parameters and notetags" follows Javascript?
Yes/no/no. Plugins are coded in JavaScript. Parameters follow a specific format designed for RPG Maker. Notetags don't do anything by themselves, you have to write code (in JavaScript) that utilizes them.
The author of the plugin I used...
I suggest you make a thread in plugin support with a link to the plugin (or if the plugin has a release thread on here, post in it for help). It does sound like either it wasn't written well with proper instructions, or perhaps you missed something.
maybe a tutorial...on the basics of parameters and code?
So, oddly...the documentation for RPG Maker
MV included a Plugin Specifications section, that described all of the plugin parameters. MZ does not appear to have this, so I'm not sure where you're supposed to get the information from (I mean, you can
look at the MV manual, but I know some things changed).
I suggest
this thread and the document it links to.
As far as code, there are many JavaScript tutorials that already exist - I type "JavaScript tutorials" into Google and get pages of results. I'd personally recommend w3schools because I like the way they explain things, but you could choose any of them (or try several).
It might be difficult for this site's blog to do that because if they write about things that are specific to RPG Maker, it will presume one already knows how to use JavaScript generally (which would not be helpful to, for example, you).
And if they wrote the tutorials presuming you're a beginner who doesn't know anything about code, it would take a bunch of them in order to get you to the point where you can do something like customizing a plugin, at which point they're simply duplicating effort that already exists on many other sites.
I'd like to see a tutorial in how to understand the code and how to update it to customize what's needed for any plugin.
Unfortunately, there's not really an easier way to do that than "learn some JavaScript." Once you understand the syntax used in the code, then reading it will make sense to you as to what it's doing, but there aren't any specific JavaScript commands that are, like, "You need to know these things to customize a plugin".
You may still need to look up the various functions and variables used internally in RPG Maker, but you can simply search your js folder to find them in the default code.
Hopefully some of that is helpful.