For what functions we use the word "On"?

2D
1

Unity uses the word “On” a lot in its function like: OnTriggerEnter, OnCollisionEnter, OnDrawGUI, OnDrawScene, OnDrawInspector, and more.
It’s sounds good to add the word “On” in my own functions like: OnEndLevel, OnStartLevel, OnArrowFire, OnJump.

Is it a good habit or bad habit to use it like that?

2

It’s a good habit and helps understand what functions do, just make sure you aren’t overlapping unity functions and that you actually call the function. Unitys On functions are automatically called.

3

Functions that begin with On are generally event-triggered function calls, used as a reaction or callback to an event that occurred.

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