What does "know-how" mean?

The knowledge and skill to be able to (do something correctly).

What is a synonym for "know-how"?

Common synonyms include: ability, acquaintance, address, adroit, airmanship, applied knowledge.

/ˈnaː.huː/ noun

noun ·Moderate ·College level

Noun

1
The knowledge and skill to be able to (do something correctly). uncountable
"Marlo has the know-how to fix your computer."
2
the (technical) knowledge and skill required to do something wordnet

"Our basic problem is the lack of know-how."

Deverbal from know how. American English, 1838.