rails commands

# Sometimes you need to prepend (bundle exec)
# eg: 
# bundle exec rails server

rails -T (show tasks)
rails server (starts server)
rails console (starts console)
rails db:migrate (runns migration - will just work one way. You can rollback one step and run it again)
rails db:rollback (rollback last migration, 1 step)

rails haml:erb2haml (convert initial .erb extensions to haml)
bundle install (if you changed the gemfile and want to install your current setup)
rvm use 2.4.1 (switch ruby version to 2.4.1)

rails generate controller Welcome (generates controller, set route and create lot of clutter)
rails generate model Post (creates more than the controller generator. Model, controller, view, routes, test etc.)

# see more at http://guides.rubyonrails.org/