When I installed gem and app, there were a lot of installs such as bundle install and yarn install, and I didn't know what they meant.
bundle install A gem called bundler manages versions of other gems
bundle install
By executing with the command, gems are checked for compatibility.
yarn install yarn is a package manager. Something like gem's bunder.
yarn install
By executing with the command, the version of the package (collection of libraries) related to javascript is managed and compatible.
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