XCode Basics 

Key concepts to cover

• Image Assets
• Icons and text
• Developer environment
• Adding Labels
• Understanding the official documentation

Sources

Swift

Beginner concepts of Swift

• Linking Xcode Designs and Swift
• Basic Conventions
• Responding to User Interactions
• List Comprehensions with IBActions
• Variables (especially Arrays) and Constants
• Range Operator, Randomisation
• If else, Switch
• Conditional Statements
• Dictionaries
• Designing and unwrapping optionals
• List Item
• List Item

Now is a right time to learnt these:

• Auto Layout
• Size Classes
• Constraints and Safe Area
• Containers
• Subviews
• Stack views

Advanced Concepts of Swift

• Getters and Setters
• Compound Properties and Advanced Properties
• Access Levels
• Optionals
• Model View Controller
• Structs and Classes
• Guard Let and If let

Sources

Networking, JSON, Parsing and Core

Key concepts

• Working with Vector Assits
• UIText Field
• Protocols (Swift)
• Delegate Design Pattern
• URL Parameters
• URL Sessions
• Closures (Swift)
• JSON Decoding
• Error Handling
• Dispatch Queue
• Protocols - Extensions and Default
• Weather APIs and Core Location for practice

Sources

CocoaApp Dep, Firebase, Table Views

Key concepts 

• Timers and For loops
• 3rd Party Libraries
• Installing Pods to your application and CLTyping Label Pod
• Choosing a Package Manager and adding Firebase
• Constants Files, Static Keyword
• Using UITable View and customizing cells
• Casting and Any
• Database Setup and saving data to Firestore
• Retrieving Data, Listening for Updates, Sorting Data
• Swift Package Manager

Now is the right time to learn SwiftUI and get into declarative programming

Key concepts for Local Data Persistance

• UITableView Controller subclassing and Delegate Method
• What is Persistent Local Data Storage and how to use UserDefaults
• Creting custom data models
• Encoding and Decoding with NSCoder
• Save data with Core Data (CRUD)
• SQLite Database
• Reading, Updating , Deleting data in CRUD
• UISearchBar and quering with Core Data
• Adding Delegate Method
• What is Realm and how to store, update and remove data from Realm
• SwipeTableViewController
• Gradient Flow Cells

Sources