I started with Redux.
But I didn't choose it. Another dev at the current project did.
It took me a few weeks to fully understand what Redux is about. I didn't know about "one store for all", the difference between actions and action creators and how immutability was mandatory.
I just jumped in and started my first component with a (rather bad) tutorial I found with google and copied a Redux store and actions from a co-worker.
The Redux docs weren't good till 1.0
After I asked Dan something I realized I got it all wrong. But now I think it's a really nice way to do front-ends.
I was always confused with 'Flux' and was never able to understand it. Redux is very nice.