Meaning of the word "know A like the back of one's hand" in English

What does "know A like the back of one's hand" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

know A like the back of one's hand

US /noʊ eɪ laɪk ðə bæk əv wʌnz hænd/
UK /nəʊ eɪ laɪk ðə bæk əv wʌnz hænd/
"know A like the back of one's hand" picture

Idiom

to be very familiar with something or to know a place or subject extremely well

Example:
I grew up here, so I know this city like the back of my hand.
She has studied the manual and knows the software like the back of her hand.