1. Xcode IDE
2. Language
   1. Swift
      1. Functional Programming
   2. Obj-c
      1. OOP
3. Human Interface GuideLine
4. iOS Technologies
   1. App Architect
   2. App Life cycle
   3. Autolayout
5. CocoaDesignPattern
   1. MVC
   2. Delegate
   3. Responder Chain
6. Swift를 활용한 심화
   1. POP
   2. Concurrent Programming
      1. Dispatch Queue
   3. Advanced Design Pattern + Reactive Programming
      1. VIPER
      2. MVVM
      3. ReactorKit
      4. RxSwift
      5. Combine
      6. SwiftUI
7. Cocoa Touch
8. Data Storage(Data Persistence)
   1. CoreData
   2. Realm
   3. Serialize
      1. Keychain
      2. JSON
      3. PList
   4. KeyedArchiver
   5. Cloud
      1. iCloud
      2. Firebase
9. Project & Workspace
   1. Build Config
   2. Scheme
   3. Target
10. Library
    1. SPM
    2. CocoaPods
    3. Carthage
11. Instruments
    1. Allocations
    2. Leaks
    3. Time Profile
12. Testing
    1. XCTest
       1. TDD
       2. Quick/Nimble
    2. UITest
    3. CodeCoverage
13. Debugging
    1. LLDB
    2. BreakPoint
14. Build & Deployment
    1. CI
       1. Fastlane
       2. Travis
       3. bitrise
       4. Jenkins
       5. Xcode Server
    2. Analytic Tools
       1. GA
       2. Firebase
          1. Crashlytics
       3. TestFlight
       4. UserHabit
15. AppStore
    1. Review Guideline
    2. iTunes Connect