One person I'd definitely consider an expert is John Lindquist (https://egghead.io/ https://egghead.io/ and https://github.com/johnlindquist https://github.com/

One person I'd definitely consider an expert is John Lindquist (https://egghead.io/ https://egghead.io/ and https://github.com/johnlindquist https://github.com/johnlindquist) - not just because he's always up to date but also because he's got some keen insights about many of those modern technologies (especially Angular). But as far as I can see tracking them is basically a full-time job, even for him.