The team behind Hanami explaining the general idea behind the architecture for their framework: ...
Good explanation of how the include method works in ActiveRecord queries: https://longliveruby.com/articles/includes-method-in-rails.
RabbitMQ is a popular message broker software. If you're using RabbitMQ in ruby/rails, consider using the bunny library for publishing messages...
Good high level overview of REST, GraphQL, and gRPC: https://www.danhacks.com/software/grpc-rest-graphql.html
Interesting article on SOLID Design Principles in Ruby: https://www.honeybadger.io/blog/ruby-solid-design-principles/