SOLID Principles
Book
In object-oriented computer programming, SOLID is a mnemonic acronym for five design principles intended to make software designs more understandable, flexible and maintainable.
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Patterns
Principle
One should depend upon abstractions, not concretions.
Principle
Many client-specific interfaces are better than one general-purpose interface
Principle
Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.
Principle
Software entities ... should be open for extension, but closed for modification.
Principle
A class should have one, and only one, reason to change.