I’ve been reviewing the SOLID principles of object-oriented design and came across some motivational posters expressing those:
LosTechies SOLID Motivational Posters
Just for reference:
S = Single Responsibility Principle
O = Open/Closed Principle
L = Liskov Substitution Principle
I = Interface Segregation Principle
D = Dependency Inversion Principle
I also enjoyed the Pluralsight.com training on this subject as well.