This one covers the Actor-Component model in Unreal Engine, from constructor vs BeginPlay timing to spawning and attachment rules. It walks through the lifecycle events (PostInitializeComponents, EndPlay reasons), when to use UActorComponent versus USceneComponent versus UPrimitiveComponent, and how CreateDefaultSubobject differs from NewObject at runtime. The network replication notes are solid if you're debugging why properties aren't ready in BeginPlay on clients. Good reference if you're tired of guessing whether to call SetupAttachment or AttachToComponent, or if you keep hitting null world pointers in constructors. The lifecycle table and component type breakdown save you from digging through engine docs every time.
npx skills add https://github.com/quodsoler/unreal-engine-skills --skill ue-actor-component-architecture