Jack of all trades, master of none
FIGURE OF SPEECH
Jack of all trades, master of none, though ofttimes better than master of one; Johannes factotum; Jacks-of-all-trades; Jack of all trades king of none; Jack of all trades and master of none
"Jack of all trades, master of none" is a figure of speech used in reference to a person who has dabbled in many skills, rather than gaining expertise by focusing on only one.