Marcin Jakubowski
Ruby on Rails for Ecommerce: Solidus Vs. Spree [2022 Update]
ActiveRecord - Part 2: Useful methods
ActiveRecord - Part 1: N+1 Queries Problem
SOLID Principles #5 - Dependency Inversion Principle
SOLID Principles #4 - Interface Segregation Principle
SOLID Principles #3: Liskov Substitution Principle
SOLID Principles #1: Single Responsibility Principle