Knowledge is always good to have… Also, we’re talking about practical mastery here. 
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Yes.
I have many suggestions on where and how to be taught JS, HTML, Java, CSS, Objective-C, Swift and a bunch of other stuff. But if your looking to mod you would need a basic understanding of coding at least. It would be best to learn JS first as everyone else has said.
I would just redirect you to a Mod Maker but currently the only one that is actually being worked on is none of them. UltimateSuite is broken and I’m not sure what happened to the Java mod maker, and my mod maker has stopped being worked on was well plus its mac only.
I would suggest https://teamtreehouse.com as I like it the most but it costs money after your done with a free trail, and the best free place to go to learn JS is just code academy like FireChaos suggested: https://www.codecademy.com/en/tracks/javascript
I agree. Codecademy teaches a lot, and I mean A WHOLE LOT, about javascript.