Refactoring

• Videos
  • Polly want a message - Sandi Metz
  • Code Refactoring: Learn Code Smells And Level Up Your Game! - Sandi Metz
  • All the little things - Sandi Metz

Design Patters

• Books

  • Head First Design Patterns

• Videos

  • Phenomenal design patterns in Vue using Vuex with Spiders - Jacob Schatz

• Websites

  • Refactoring Guru

Testing

• Videos
  • The Magic Tricks of Testing - Sandi Metz