The particular technology that sticks out to me here is GatsbyJS. It allows you to create blazing fast websites that when it comes to shipping is just a static site. It gives you all the power of React with a lot of boilerplate abstracted away from you.
No need to know webpack or routing as it provides you a basic framework to allow you to just start building websites. I think this is how I would build websites if I was still in the client services business.
The docs are great and they have so many plugins available to you its crazy. I like how it is CMS agnostic and allows you to use Contentful, WordPress, or even just plain old markdown files (which is what I'm using for this website).
I took the task of redeveloping my website using GatsbyJS and couldn't believe how quickly I could do it. All this while still being a newbie to it.
The other technology that interests me is utility frameworks and in particular Tailwind CSS. It was created by someone I have followed for a long time, Adam Wathan so that definitely helps.
It takes a bit of a controversial approach where all you do is assign long list of class names to elements that control the styling. This is a large shift from the concept of not having style information in your markup.
When redoing my site I used Tailwind CSS and I was surprised at how my workflow changed. It was easy to play around with how I wanted padding and such. Try
px-4, nope thats too wide, try