MyGame/
  Source/
    MyGame/
      Public/           # Headers (.h)
        Player/
        Enemies/
        UI/
        Systems/
      Private/          # Implementation (.cpp)
        Player/
        Enemies/
        UI/
        Systems/
      MyGame.Build.cs
      MyGame.h
  Content/
    Blueprints/
    Maps/
    Materials/
    Textures/
    Meshes/
    Audio/
    UI/
  Config/
    DefaultEngine.ini
    DefaultGame.ini
    DefaultInput.ini
  Plugins/
  MyGame.uproject

// Header - Public/Player/MyCharacter.h
UCLASS()
class MYGAME_API AMyCharacter : public ACharacter
{
    GENERATED_BODY()

public:
    AMyCharacter();

protected:
    virtual void BeginPlay() override;
    virtual void Tick(float DeltaTime) override;
    virtual void SetupPlayerInputComponent(UInputComponent* Input) override;
    virtual void EndPlay(const EEndPlayReason::Type EndPlayReason) override;

    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Stats")
    float MaxHealth = 100.f;

    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Components")
    UHealthComponent* HealthComponent;

    UFUNCTION(BlueprintCallable, Category = "Combat")
    void TakeDamage(float Amount, AActor* DamageCauser);

private:
    UPROPERTY()
    float CurrentHealth;
};

// Implementation - Private/Player/MyCharacter.cpp
AMyCharacter::AMyCharacter()
{
    PrimaryActorTick.bCanEverTick = true;
    HealthComponent = CreateDefaultSubobject<UHealthComponent>(TEXT("HealthComp"));
}

void AMyCharacter::BeginPlay()
{
    Super::BeginPlay();
    CurrentHealth = MaxHealth;
}

// Editable in editor, readable/writable in Blueprints
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Stats")
float Speed;

// Only visible in editor, read-only in Blueprints
UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Components")
USceneComponent* Root;

// Replicated for multiplayer
UPROPERTY(Replicated)
int32 Score;

// Replicated with notification
UPROPERTY(ReplicatedUsing = OnRep_Health)
float Health;

// C++ base with BlueprintNativeEvent
UFUNCTION(BlueprintNativeEvent, Category = "Combat")
void OnDeath();
void OnDeath_Implementation();  // Default C++ behavior, overridable in BP

// Ability
UCLASS()
class UGA_FireBall : public UGameplayAbility
{
    GENERATED_BODY()
public:
    virtual void ActivateAbility(...) override;
    virtual void EndAbility(...) override;
    virtual bool CanActivateAbility(...) const override;
};

// Gameplay Effect for damage
UCLASS()
class UGE_FireDamage : public UGameplayEffect
{
    // Configure in editor: damage value, duration, tags
};

// Single-cast delegate
DECLARE_DELEGATE_OneParam(FOnHealthChanged, float);

// Multi-cast delegate (Blueprint compatible)
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnHealthChangedDynamic, float, NewHealth);

// Usage in class
UPROPERTY(BlueprintAssignable)
FOnHealthChangedDynamic OnHealthChanged;

// Broadcast
OnHealthChanged.Broadcast(CurrentHealth);

void AMyCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInput)
{
    auto* EIC = CastChecked<UEnhancedInputComponent>(PlayerInput);

    EIC->BindAction(MoveAction, ETriggerEvent::Triggered, this, &AMyCharacter::Move);
    EIC->BindAction(JumpAction, ETriggerEvent::Started, this, &AMyCharacter::StartJump);
}

// Server-authoritative function
UFUNCTION(Server, Reliable)
void ServerFireWeapon(FVector Direction);

// Multicast to all clients
UFUNCTION(NetMulticast, Unreliable)
void MulticastPlayFireEffect();

// Client-only
UFUNCTION(Client, Reliable)
void ClientShowDamageNumber(float Amount);

// Replication conditions
void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutProps) const override
{
    Super::GetLifetimeReplicatedProps(OutProps);
    DOREPLIFETIME_CONDITION(AMyCharacter, Health, COND_OwnerOnly);
}