How to install rails on localhost?

Rails Installation commands

Step 1:- Login as super user using command
         => sudo su

Step 2:- The ROR installation begins with installing RVM on the server. It is important to install the latest version of RVM on the system, this requires an installation of the CURL command. The following command does the job.
         => apt-get install curl

Step 3:- To proceed with the RVM installation, import the rvm.io public key in the server system using this command.
         => curl -#LO https://rvm.io/mpapis.asc
         => gpg --import mpapis.asc

Step 4:- Then download the RVM installer with curl and execute it (by piping the curl output to bash) using this command
         => curl -sSL https://get.rvm.io | bash -s stable

Step 5:- The next step is to build the RVM environment and to save the settings of this environment into current shell. This is done with the following command.
         => source /etc/profile.d/rvm.sh

Step 6:- Install the Ruby dependencies with the RVM command below:
         => rvm requirements
         The following command lists the available ruby versions:
         => rvm list known

Step 7:- Using RVM makes the independent management of ruby versions an easy process. The command listed below installs the Ruby version 2.4.2
         => rvm install 2.4.2

Step 8:- In order for the applications to use Ruby, the default ruby version needs to be set. The following command sets Ruby 2.4.2 as default version.
         => rvm use 2.4.2 --default

Step 9:- Rails can be easily installed with the Ruby gem installer. 
         => gem install rails