Follow everything in your pace, and ready everything thoroughly.
Hartl's tutorial was where I started, many years ago. I think he keeps it updated.
The best way to learn web dev is to build the thing you want. You'll learn what you need as you go.
I would like to augment this advice with the very helpful but rarely mentioned step of actually reading through all the docs eventually and learning best practices from research on blog posts, open source projects, and other internet communities. This is especially important when learning a technology in the absence of a mentor/senior developer.
In the past, I’ve been burned thinking I built up a serviceable knowledge through learning as I go on my own projects. This approach is a great way that falls in line with the fact that a lot of new technologies are still just the same old fundamentals, but it’s important to recognize that true skill in a specific technology requires that extra, quite laborious, step.
However, for an "opinionated" framework like Rails, it's really best if you read through the official (brief, and IMHO excellent) guides so you can get a feel for the basic opinions baked into Rails.
https://guides.rubyonrails.org/
Otherwise you're going to be fighting the conventions the entire way.
Then i go with Ruby on Rails, with help of some good tutorials. The point is, get accquainted with git, rails convention, testing and deployment.
Skip the Javascript part as most as possible first.
The important thing on this journey, is you'll eventually love Ruby, let it drive your fun, curiosity and happiness along the way.
Good luck!
Frameworks like Rails extend Ruby rather seamlessly. If you're entirely new to both Ruby and Rails, that's a looooooooooooooooot.
If one must absolutely must learn everything in a day or two, one can probably just look at the official Rails Guides. That is sufficient to write a Hello World or simple CRUD app, and Ruby is simple+friendly enough not to pose a challenge.
However, getting familiar with Ruby outside of Rails is highly recommended. It's fast and easy to learn. As a bonus IMHO you don't need the more complex bits (metaprogramming, etc) for typical Rails app development.
Good luck!
