LOW-LEVEL-DESIGN SOLID Principles Design Patterns References / Links Java OOPs https://www.youtube.com/playlist?list=PL9gnSGHSqcno1G3XjUbwzXHL8_EttOuKk SOLID Principles https://www.youtube.com/watch?v=XI7zep97c-Y&t=457s https://medium.com/backticks-tildes/the-s-o-l-i-d-principles-in-pictures-b34ce2f1e898 Design Patterns https://refactoring.guru/design-patterns https://sourcemaking.com/design_patterns https://www.youtube.com/playlist?list=PLrhzvIcii6GNjpARdnO4ueTUAVR9eMBpc