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Interface and implementation blocks define an Objective-C class.

Categories allow addition of methods to existing classes.

ARC automates memory management by keeping track of object ownership.

@synthesize generates getter and setter methods for properties.

Structs are compound data types that group variables under a single name.

Methods in Objective-C are declared in the interface block.

Blocks are anonymous functions that capture surrounding variables.

Protocols define a list of methods that can be implemented by any class.

Strong and weak references affect memory management.

nil is used for object pointers, while Nil is used for class pointers.

NSDictionary is an immutable dictionary class that holds key-value pairs.

NSString is an immutable string class.

@property is used to declare properties in the interface block.

Methods in Objective-C are defined in the implementation block.

Enumerations define a set of named integer values.

NSArray is an immutable array class that holds objects.

Objective-C allows objects to be typed dynamically with id.

NSException is the base class for handling exceptions in Objective-C.

An autorelease pool is used for managing memory in a reference-counted environment.

The for loop is used to repeat a block of code a specified number of times.

IBOutlets are properties that can be connected to user interface elements in Interface Builder.

Blocks can be passed as arguments to methods to be executed as callbacks.

The switch statement selects one of many blocks of code to be executed.

KVO is a mechanism that allows objects to be notified of changes to specific properties of other objects.

IBActions are methods that can be connected to user interface events in Interface Builder.

The autorelease method adds the object to the current autorelease pool, to be released at a later time.

The if-else conditional is used to perform different actions based on conditions.

Try-catch is used to catch exceptions in a block of code.

The do-while loop is similar to a while loop, but the block of code is executed at least once.

The while loop executes a block of code as long as a condition is true.

The Target-Action mechanism is used by controls to invoke methods in response to user actions.

typedef creates a new name for an existing type.

Selectors are a way to refer to a method by its name.

Delegates are used for callback mechanisms and control transfer between objects.

The retain message increases the retain count of an object.