Here is a curated links of sites that are I think are useful as I learn or relearn Ruby and Rails further. Incomplete of course but there's always the internet. Will add any that are worthy to be linked here. For now, this would suffice. If you think there are links worthy to be added here, let me know in the comment …

Check list of known versions 1~$ rvm list known Install specific version 1~$ rvm install ruby-2.7.2 Check installed version 1~$ rvm list 2=* ruby-2.7.2 [ x86_64 ] 3ruby-3.0.0 [ x86_64 ] 45# => - current 6# =* - current && default 7# * - default Switch versions 1~$ rvm use ruby-3.0.0 2Using …

Install RVM + Rails Manage Ruby versions (production or not using RVM). Trust me, been there and installing it otherwise is not a walk in the park... 1~$ gpg2 --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB 2~$ curl -sSL https://get.rvm.io | bash -s stable 3~$ curl -sSL …

You recently installed rails but since you're still learning, you did a lot of stuffs. One day, you got the following error: 1~$ rails --version 2Traceback (most recent call last): 32: from /usr/local/bin/rails:23:in `<main>' 41: from /usr/lib/ruby/2.7.0/rubygems.rb:294:in `activate_bin_path' …

If you no longer wish to use RVM, you can uninstall it by first removing the script calls in your .bashrc file and then removing the RVM files. First, remove the script calls with a text editor like nano: 1~$ nano ~/.bashrc Scroll down to where you see the RVM lines of your ~/.bashrc file: 1... 2# Add RVM to PATH for …

Gems Ruby applications or libraries. In Rails, you install gems so you would write less code. Creating Gemset To make it easy to manage, create gemset. Think of it as a group of libraries that you can switch to depending on situation. 1~$ rvm gemset list 23gemsets for ruby-2.7.0 (found in …