- UI : Storyboarding, Autolayout, Animation, Graphics, Text, UIKit, User Interaction(touches, gestures) - Core : iOS SDK, XCode, Cocoa, iOS Guidelines - Communication & Networking : RestKit, AFNetworking, SwiftyJSON, Alamofire, Moya, ObjectMapper - Hardware and Media: GPS, Playing Audio/Video, Accelerometer, Camera - Persisting Data: NSUserDefaults, Files, SQLite, Backup and Sharing data - Interacting with System : Push notification, background working, Contacts, Calendar - Graphics: Canvas - Social: Facebook, Twitter, Linkedin, Instagram, Google+ - Google Services: Firebase, Analytics, Maps, Location, Cloud Messaging, Mobile Ads, - Vcs: Git, Bitbucket