Yea, just agreeing with the other commenter. Creating a Rails app is the way to go to get started with Ruby. https://guides.rubyonrails.org/getting_started.html

It's my favorite programming language but I seldom get to use it because I'm an AI Engineer. But I just recently went out on my own so I guess that can change now, hm...

I would actually start with the Rails Guides docs, they’re very good and running the given commands should actually work:

https://guides.rubyonrails.org/getting_started.htm

Just have a toy app you want to build in mind

Rails still the “batteries included” piece of Ruby. Recently added parts like Hotwire, SolidQueue etc are pretty interesting to know.

Outside of it, you might find interesting libraries like sinatra, sequel, roda, dryrb, faraday, sorbet, truffle ruby…