`delta` : when and when not to use it?

[rom1dev]

This is a good explanation !
But your reply begins with “No, …”. It’s like you are contradicting someone and as my reply comes just before, I feel like it can be myself. But as what you say is already clear to me, I don’t understand.

My last reply was related to:

@ikanaut

velocity.x = move_toward(velocity.x, move_speed, acceleration * delta * 0.5)
velocity.y += gravity * delta * 0.5
move_and_slide()
velocity.x = move_toward(velocity.x, move_speed, acceleration * delta * 0.5)
velocity.y += gravity * delta * 0.5

I was trying to explain what this schema does:

The dashed red square shows what happens between two calls to move_and_slide()

@rom1dev

velocity will increase of two halves of two different deltas.