ENGTRA2 unit 6 vocabulary a

to know [something] like the back of [your] hand.

(a) know-all
or
know-it-all

to know [something] by heart.

to know better.

For all I know ...

to know what's good for [you]

to learn the hard way

to learn the ropes

to learn a thing or two

to learn to live with [it]