Install Ruby

1. Install RVM

curl -L https://get.rvm.io | bash -s stable  

//If you have an error  
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
curl -L https://get.rvm.io | bash -s stable

2. Apply RVM

source ~/.rvm/scripts/rvm

3. Install Ruby

rvm install 2.3.0

Install RubyGems

1. Download RubyGems

2. Unpack downloaded file into a directory

3. Change directory to unpacked folder

cd there

4. Ruby setup

$ ruby setup.rb

5. If you have rubygems version error

sudo gem update --system

Install jekyll

1. Install jekyll gem

rvmsudo gem install jekyll

Run jekyll

jekyll new jehyunpark.github.io
cd jehyunpark.github.io
jekyll serve