 
    
  
      
    | Debian / Ubuntu | sudo apt-get install git-core | 
| Fedora | sudo yum install git-core | 
| Windows | Download and install msysGit | 
| OS X | Use the git-osx-installer | 
See the git page for the most recent information.
Have a look at the github install help pages available from github help
There are good instructions here: https://git-scm.com/book/en/v2/Getting-Started-Installing-Git