can make own gem and publish it to https://rubygems.org RubyGems # install gem $ gem install nokogiri $ irb > require ‘nokogiri’ > doc = Nokogiri::HTML.parse('<div class="hello">world</div>') > doc.search('.hello').text => "world" * irb is Interactive Ruby. REPL for Ruby. Similar to PEAR for PHP, CPAN for Perl, pip for Python, npm for Node.js etc
cat Gemfile source ‘https://rubygems.org' gem ‘nokogiri’ gem ‘rails’ $ bundle #=> Install all gems listed in Gemfile Bundler makes sure Ruby applications run the same code on every machine by installing given list of gems and its depending gems Similar to composer for PHP, carton for Perl, CocoaPods for iOS, etc
Guides - Rails guide for beginner programmer http://guides.railsgirls.com/ Rails Tutorial https://www.railstutorial.org/book Rails API References http://api.rubyonrails.org/ Good documents to learn Rails