Core Unity concepts and frequently used APIs for Unity 6.5 (6000.5.10).

GameObjects and Components

MonoBehaviour and Lifecycle

Transform

Vector3 and Quaternion

Time and deltaTime

GetComponent and References

Inspector and SerializeField

Instantiate and Destroy

Prefabs

Coroutines

Scenes and SceneManager

Enabling and Disabling Objects and Components

Tags and Layers

Debug, Console and Gizmos

Finding Objects in a Scene

Input System Basics