good for; good at
Ese ejercicio es bueno para los músculos abdominales.
That exercise is good for the abdominal muscles.
Cualquier sitio es bueno para descansar.
Any place is good for resting.
He's good at that job.
Es bueno para los negocios tener contactos.
It's good for business to have contacts.
Dan es bueno para acercarse a los extraños.
Dan is good at approaching strangers.
El deporte es bueno para tu salud.
Sport is good for your health.
Swimming is good for your health.