(1) Create a ".gitignore" file at the root level of your project.
(2) Edit the file and place the list of files and directories to ignore. E.g.
# Ignore bundler config. /.bundle # Ignore all logfiles and tempfiles. /log/* /tmp/* !/log/.keep !/tmp/.keep .byebug_history /.rubocop_todo.yml /config/api_key.yml /doc/ # Ignore encrypted secrets key file. config/secrets.yml.key
If you are using IDE such as Rubymine or Android Studio, you can install the .ignore plugin and use it to automatically create the .gitignore file with the built-in template for Ruby.
(3) References: