Anti-patterns and code smells
Anti-patterns and code smells are architectural bad practices or tips about possible bad design. Learning about best practices is as important as learning about bad ones, which is where we start. Moreover, there are multiple anti-patterns and code smells throughout the book to help you get started.
Unfortunately, we can't cover every detail of every topic, so I encourage you to dig deeper into those fields as well as into design patterns and architectural principles.
Anti-patterns
An anti-pattern is the opposite of a design pattern: it is a proven flawed technique that will most likely cause you some trouble and cost you time and money (and probably give you a headache or two along the way).
A priori, an anti-pattern is a pattern that seems to be a good idea, and that seems to be the solution that you were looking for, but in the end, it will most likely cause more harm than good. Some anti-patterns started out as legitimate design patterns...
