| Name | Category | Popularity | Difficulty |
|---|---|---|---|
| Singleton | Creational | ★★★★★ | ★★★ |
| Factory Method | Creational | ★★★★★ | ★★★ |
| Observer | Behavioral | ★★★★★ | ★★★ |
| Adapter | Structural | ★★★★ | ★★★ |
| Facade | Structural | ★★★★ | ★★★ |
| Composite | Structural | ★★★★ | ★★★ |
| Decorator | Structural | ★★★★ | ★★★ |
| Proxy | Structural | ★★★★ | ★★★ |
| Strategy | Behavioral | ★★★★ | ★★★ |
| Template Method | Behavioral | ★★★★ | ★★★ |
| Builder | Creational | ★★★★ | ★★★★ |
| Command | Behavioral | ★★★★ | ★★★★ |
| Iterator | Behavioral | ★★★★ | ★★★★ |
| Mediator | Behavioral | ★★★ | ★★★★ |
| Memento | Behavioral | ★★★ | ★★★★ |
| State | Behavioral | ★★★ | ★★★★ |
| Visitor | Behavioral | ★★★ | ★★★★ |
| Abstract Factory | Creational | ★★★ | ★★★★★ |
| Chain of Responsibility | Behavioral | ★★★ | ★★★★★ |
| Interpreter | Behavioral | ★✩ | ★★★★★ |
| Flyweight | Structural | ★✩ | ★★★★★ |
Note: Popularity and difficulty are subjective measures, and this table is just a general guide.