know one's way around
know one's way around or know one's way about {v. phr.}
1. To understand how things happen in the world; be experienced in the ways of the world.
The sailor had been in the wildest ports in the world. He knew his way around.
Compare: HAVE BEEN AROUND.
2. or {informal} know one's onions or know one's stuff
To have experience and skill in an activity.
Before trying to make any pottery, it is better to get advice from someone who knows his stuff in ceramics.
Compare: DRY BEHIND THE EARS.
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Source: A Dictionary of American Idioms
