what's the difference between goal and objective

Well, context would help, but generally, the goal is stated and the objectives tell how the goal will be reached.

For example:

Goal: have a clean bedroom.

Objectives:
bed is made daily
clothes are picked up at night
vacuum every Sat. morning

Definition of Goals and Objectives
Goals – are long-term aims that you want to accomplish.
Objectives – are concrete attainments that can be achieved by following a certain number of steps.
Goals and objectives are often used interchangeably, but the main difference comes in their level of concreteness. Objectives are very concrete, whereas goals are less structured.

I think they are the same.

I think that they are the same too, until the nuance is different.

Nuances? Give me the old ones every time.