jack-of-all-trades, master of none
US /ˌdʒæk əv ɔːl ˈtreɪdz ˌmæstər əv nʌn/
UK /ˌdʒæk əv ɔːl ˈtreɪdz ˌmæstər əv nʌn/
1.
a person who is good at many different things but is not an expert at any of them
:
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He's a real jack-of-all-trades, master of none; he can fix a leaky faucet, bake a cake, and even play the guitar, but he's not exceptional at any of them.
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The company needs specialists, not a jack-of-all-trades, master of none.