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Daughter Jennifer lives near a small village in the foothills of the Austrian Alps, not very far from where a well-known California governor and former Mr. Universe grew up. There must be something in the water.
The one-arm dumbbell press of course develops shoulder and arm strength. Maybe even more than pressing a barbell or two dumbbells at once, one-arm pressing requires serious tightening all of the muscles of your lower back and abdominals (currently known as the "core"). And that is a good thing.
I always recommend exhaling as you press and inhale as the weight returns. If you are a beginner, develop a smooth style and tempo similar to Jennifer's before moving up to heavier weights. Give it a try. I think you'll realize right away its value as a compound exercise movement.