--A library is a collection of complex programs. ――RubyGems is a general term for Ruby libraries, not gum. --Gem is each library in RubyGems. It's not mouthwash. --Gemfile is a file that describes and manages the Gem name and version of the Gem used in the application. --Gemfile.lock is a file that records bundle-installed Gem bundle bundler
--CRUD is an acronym for basic processing related to application data handling. ――The seven actions are a general term for the basic actions in Rails: index, show, new, create, edit, update, destroy. --The resources method is a method that automatically generates routes to 7 actions.
--Strong parameters are those that receive only parameters with the specified key. --Private methods are methods that cannot be called from outside the class. --Validation is to impose certain restrictions when registering data. --Increase security
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