If you do something selectively, you do it by choosing only some things and not others.
Doing something selectively can show that you are careful and thoughtful about what you choose.
Examples:
She picked the best apples selectively.
He ate the candy selectively, leaving the ones he didn't like.
The cat only ate the fish selectively.
He watched TV selectively, only choosing the best shows.
She only wears her favorite clothes selectively.
He reads books selectively, only reading the ones with pictures.