- OSI-7 Layer
- TCP/IP
- I/O
- HTTP
- Authentication
- WebSocket
- VPC
- Load Balancing
- DNS
- WEB
- Proxy
- Relation
- SQL
- Normalization
- Transaction
- Index
- Distributed Database
- Optimizer
- System Call
- Process
- Memory Allocation
- Hardware
- File System
- Single-responsibility Principle
- Open-closed Principle
- Liskov-substitution Principle
- Interface-segregation Principle
- Dependency-inversion Principle
- Singleton
- Abstract Factory
- Factory Method
- Builder
- Adapter
- Decorator
- Proxy
- Composite
- Facade
- Strategy
- Observer
- Template Method
- Command
- Iterator
- State
- Chain Of Responsibility
- Tree
- Sort
- JVM
- Object-oriented Programming
- Class
- Static
- Exception
- Equality
- String
- List
- Map
- Set
- Synchronization
- Generic
- Serialization
- Lambda
- Reflection
- Data Class
- Scope Function
- Trailing Lambda
- Inline Function
- Coroutine
- Closure
- Framework
- Application Context
- Object Relational Mapping
- Entity
- Persistence
- Transaction
- Lock
- Servlet
- Filter/Interceptor
- Multi-version Concurrency Control
- Lock
- Index