たとえばRubyのgitignoreを一瞬で作るだけで強くなれること

Ref

.gitignore_globalを自動生成！便利！しかし落とし穴が.. - Qiita

https://www.gitignore.io/

Result

https://www.gitignore.io/api/ruby

# Created by https://www.gitignore.io/api/ruby
# Edit at https://www.gitignore.io/?templates=ruby

### Ruby ###
*.gem
*.rbc
/.config
/coverage/
/InstalledFiles
/pkg/
/spec/reports/
/spec/examples.txt
/test/tmp/
/test/version_tmp/
/tmp/

# Used by dotenv library to load environment variables.
# .env

## Specific to RubyMotion:
.dat*
.repl_history
build/
*.bridgesupport
build-iPhoneOS/
build-iPhoneSimulator/

## Specific to RubyMotion (use of CocoaPods):
#
# We recommend against adding the Pods directory to your .gitignore. However
# you should judge for yourself, the pros and cons are mentioned at:
# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
#
# vendor/Pods/

## Documentation cache and generated files:
/.yardoc/
/_yardoc/
/doc/
/rdoc/

## Environment normalization:
/.bundle/
/vendor/bundle
/lib/bundler/man/

# for a library or gem, you might want to ignore these files since the code is
# intended to run in multiple environments; otherwise, check them in:
# Gemfile.lock
# .ruby-version
# .ruby-gemset

# unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
.rvmrc

# End of https://www.gitignore.io/api/ruby

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