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I can see how it can be overwhelming, as with everything the beginning is the hardest but it will get easier over time. Seeing a ternary the tenth time will be much easier than the first.
Regex generally is a mine field, who actually knows what they are doing haha. I can recommend using https://regex101.com/ or https://regexr.com/ or similar as it makes it a lot easier.
As to new JS features, I would look for the old-ish articles and tutorials that introduce es6, for example: https://babeljs.io/docs/en/learn/ idk if you need to go earlier, but surely there has been written a ton on updates.
I think it's good to realize most of it is not new, it's mostly the same stuff, just slightly different and more convenient.
You should check out the free online ebook series You Don't Know JS [0].
Go straight to the last book in the series, called "ES6 & Beyond" [1] which specifically covers the most important features of JavaScript that have appeared since you last worked with it.
For hands on practice with newer JS features, the best resource is Execute Program's "Modern JavaScript" [2] course. Once you work through that, move on to their TypeScript Basics course [3]. Both are amazing. Execute Program is the best tool for learning a programming language that I've ever used.
[0]: https://github.com/getify/You-Dont-Know-JS/blob/1st-ed/READM...
