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Most popular and useful design principles (Work@Tech website)

1. Software Design Principles - I (DRY, YAGNI, KISS, etc)
2. Software Design Principles - II (Abstraction, Extensibility, Cohesion)
3. Software Design Principles - III (SOLID Principles)

• SOLID Design Principles with Example

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Design-Patterns-Java

Creational Patterns

1. Factory Method
2. Abstract Factory
3. Builder
4. Prototype
5. Singleton

Structural Patterns

1. Adapter
2. Bridge
3. Composite
4. Decorator
5. Facade
6. Flyweight
7. Proxy

Behavioral Patterns

1. Chain of Responsibility
2. Observer
3. Strategy
4. Template Method
5. State
6. Command
7. Mediator
8. Iterator

References

1. Java Design Patterns - Example Tutorial
2. Software Design Patterns Tutorial

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Low Level Design Problems

• Practical low-level design (LLD) problems

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• ParkingLot
• Chess Game
• SnakeAndLadder Game
• SplitWise
• TicTacToe Game
• Elevator Design
• Library Management