• Reset is only called in editor mode.
• Very useful to setup values for your attributes, i.e. find a child component.
• Use it with the RequireComponent attribute to always get a reference for your component.

• Awake will still be called for disabled components on enabled objects.

• Start is guaranteed to be called before the first FixedUpdate() or Update() for this component.
• If no FixedUpdate() or Update() events are defined, Start will be run at the end of the frame the object awoke on.

• Both events are not affected by script execution order.
• Scene is traversed from each root separately in unspecified (non-hierarchy) order, e.g. [root 1 and all its children], [root 2 and all its children]. “root” being a top-level GameObject in scene.
• All OnDisable calls are performed before all OnDestroy calls within a single root.
• Only root GameObject activeSelf is changed, for children it will not be changed.
• Components are traversed in the order they appear in Inspector, top to bottom.
• OnDisable:
  • Call order: same as hierarchy, child before parent.
  • activeInHierarchy propagation can be unfinished for the following siblings and their children.
• OnDestroy:
  • Call order: same as hierarchy, parent before child.

(Above Tested with 2017.4 and an opened Scene running in play mode in editor by stopping the play mode, may differ for other versions/situations)

• Does not get called if the game object is rendered by a ugui CanvasRenderer

• Does not get called if the game object is rendered by a ugui CanvasRenderer