He is a jack of all trades, master of none.
jack of all trades, master of none
idiomA person who has a competent grasp of many skills but who is not outstanding in any one.
Origin
disputed originExpanded form of jack of all trades, which originally was sometimes used as a term of praise. In the 21st century this phrase has itself been (rarely) expanded to a couplet: : Jack of all trades, master of none, : though oftentimes better than master of one.
She can fix cars, paint houses, and cook, but she is a jack of all trades, master of none.
While his broad knowledge makes him a useful assistant, he remains a jack of all trades, master of none, lacking the deep expertise required for the lead role.
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bar none
Without exception; excluding nothing else of the same kind.
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Buckley's and none
A supposed two chances (probabilities), being Buckley's chance (meaning a very small chance) or no chance at all.
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come from a Cracker Jack box
To obtain or retrieve something that is useless, cheap or fake.
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have none of something
To be completely unwilling to accept or support something.
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it's none of your business
It's a matter (especially a private or personal one) that you are not entitled to be involved in or informed about.
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jack in
To stop doing a regular activity, such as a job or studying.
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jack of all trades
One competent in many endeavours, sometimes regarded as not excelling in any of them.
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Jack Tar
Alternative letter-case form of jacktar.