I know markup languages and have experience editing python and c++.
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Speaking to your prior experience: JavaScript is curly brace C-ish syntax with python style typing.
There are at least half a dozen ways of creating a class; all acceptable. As C++ hides its soft pointer underbelly as much as possible, JS hides its prototype foundation. Stick with modern class syntax; it’s generally less quirky than other methods. At the same time, you have to know that others exist. The this can be an odd moving target.
I suppose, as with the class thing, you want to be aware of when a tutorial was written. The language has grown of the years.
You can play around with JS sans browser with something like node: good for just quickly testing things out.
Good luck.
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