What would be the purpose of these lights?

I'd follow the Dark Sky guidelines for exterior lighting.

"lighting should

• Only be on when needed
• Only light the area that needs it
• Be no brighter than necessary
• Minimize blue light emissions
• Be fully shielded (pointing downward)"

looking for good advice on placement.

i guess for different reasons. . to accent/highlight the house, make the house visible during dusk, security, Deter people from trying to break in, Brighten up the house when arriving/leaving the house home in the dark?

• Downward facing light mounted under the eaves to illuminate the porch without bleeding into the yard.
• Step lights, if needed, to illuminate the steps that lead from the path to the porch (photos don't show this area).
• Path lights along the path from the steps to the garage. Could also be step lights attached to the house.
• Path lights along the driveway from the garage to the sidewalk.
• Maybe downward facing sconce above the garage turned on by motion detector to aid exit/entry from/to garage.

"planning to have hanging lamps at each side of the garage"

• Nope.