Ruby 
is an interpreted, high-level, general-purpose programming language. It supports multiple programming paradigms, including procedural, object-oriented, and functional programming.
Install ruby with rbenv so that you can manage your ruby versions. Your system may come with Ruby, but it might be a tad old.
Most webby stuff runs on the Rails framework which has great defaults to get you started quickly.
There's a great background jobs processor called Sidekiq which can help you split long running tasks out to another server.
For other random frameworks, checkout the awesome-ruby project on github.
I wrote a script for rbenv to check for newer rbenv versions
# REPL for Experimenting * pry - a feature rich interactive shell for the Ruby programming language. * irb - the built in repl for ruby, does what it needs to.
# Debugging
* Execute a single test with `rspec -e "test my flub"` and quote of the exact broken test when running
* Use `byebug` or `binding.pry` and step through the code.
* `puts` relevant stuff
* TODO ruby debugger vim integration? Investigate astashov/vim-ruby-debugger
# Testing
* Use Rspec, it's the bomb!
* Try Simple Cov to get code coverage
* For Mutation Testing, try Mutant.
# Trix * Be functional with Proc
# Tuning your programs
* Profile through ruby-prof .
* Use the built in benchmark module .
* For rack or rails projects, check out Rack Mini Profiler
* Another one that's come up in #devtrain is New Relic RPM .
# Linting and text Editor Tools
* Rubocop has ruby best practice checks.
* When using with Vim's Syntastic, do a doubletake on the rubocop instructions .