If you wish to succeed, you should use persistence as your good friend, experience as your reference, prudence as your brother and hope as your sentry.
Luck's study notes, about Java/Golang/Ruby/Kubernetes/Architecture/algorithm/Network/OperationSystem, etc.
A Ruby Gem to get constellation from birthday.
Using this gem, you can extend model attributes. You can set a config for a field and then get many useful methods.