MichaelCurrin/install-jekyll.md

## install-jekyll.md

      
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              install-jekyll.md
            
          
    Install Jekyll

Prerequisites - install Ruby and Bundler globally for your user.
Install Jekyll in a project

Jekyll 3.9

This is the version that runs on GH Pages.
Set up your project gems. Note that the Kramdown parse must be installed explicitly in Jekyll 3.9 (but no 3.8 or 4.x).

Gemfile
source "https://rubygems.org"

gem "jekyll", "~> 3.9"
gem "kramdown-parser-gfm", "~> 1.1"


Then run:
$ bundle config set --local path vendor/bundle
$ bundle install
See Gemfile in my jekyll-blog-demo project.
Jekyll 4

This is the more modern version of Jekyll. In particular, it is much faster because of caching. See also Migrating 3.x to 4.x in the docs.
Set up your project gems.

Gemfile
source "https://rubygems.org"

gem "jekyll", "~> 4.2"


Then run:
$ bundle config set --local path vendor/bundle
$ bundle install
Global Jekyll install

Not recommended, unless you plan to use the same Jekyll version across all your projects. Or you want to run jekyll new from anywhere.
macOS and Linux

$ gem install jekyll --user-install
$ jekyll --version
Windows

Follow the Jekyll on Windows install guide.
You can download and run the Ruby installer - see Installation via RubyInstaller.
Or use Windows subsystem for Linux - see Installation via Bash on Windows 10.