Generally speaking - you want to start training the biggest muscle groups first because you have the most energy
Later on in the workout, you will be more fatigued so it makes sense to train the small muscle groups after the larger muscle groups.
If you are planning on training chest shoulders and triceps in a workout, then it makes the most sense to first train chest, then shoulders and then triceps
Later on in the workout, you will be more fatigued so it makes sense to train the small muscle groups after the larger muscle groups.
If you are planning on training chest shoulders and triceps in a workout, then it makes the most sense to first train chest, then shoulders and then triceps