English Study Group

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I'm afraid that I'm a Jack in all trades, but master for none.
Jack in all trades, but master for none: a figure of speech used in reference to a person who has dabbled in many skills, rather than gaining expertise by focusing on one.
birds of a feather: people who are similar in character.
toe the mark/line: to adhere or conform to the rules of something.
He is a chip off the old block.
a chip off the old block: someone who resembles their parent in character or appearance.

synonym: He is the spitting image of his father.

E.g. sample sentence