How to learn Rails
Rails is the perfect stack for Indie Hacking. If you already know programming, and you want to start with Rails, here are the advices I would give to newcomers : https://bootrails.com/blog/how-to-learn-rails
I would say that Rails is quite easy - at least took one by one, problems are easy to solve thanks to Rails. But Rails is thick, just because Web Dev is a wide discipline.
Thanks @bdavidxyz! I first learned Rails using Michael Hartl's excellent Rails Tutorial. There are many ways to get started, but it's crucial — as you also state in your article — that you ship early and often. Cheers!