a little knowledge is a dangerous thing

A person who knows a little about something may think he knows it all and make bad mistakes. — A proverb.

/John has read a book on driving a car and now he thinks he can drive. A little knowledge is a dangerous thing./

Source: A Dictionary of American Idioms

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	knowledge [knowledge] See: A LITTLE KNOWLEDGE IS A DANGEROUS THING, TO THE BEST OF YOUR KNOWLEDGE. ... A Dictionary of American Idioms dangerous [dangerous] See: A LITTLE KNOWLEDGE IS A DANGEROUS THING. A Dictionary of American Idioms little [little] See: A LITTLE, A LITTLE KNOWLEDGE IS A DANGEROUS THING, GREAT OAKS FROM LITTLE ... A Dictionary of American Idioms thing [thing] See: A LITTLE KNOWLEDGE IS A DANGEROUS THING, DO ONE'S THING or DO ONE'S ... A Dictionary of American Idioms know a thing or two about [know a thing or two about] {v. phr.} To be experienced in; have a fairly ... A Dictionary of American Idioms tell a thing or two [tell a thing or two] {v. phr.}, {informal} To tell in plain or angry words; ... A Dictionary of American Idioms to the best of one's knowledge [to the best of one's knowledge] As far as you know; to the extent of ... A Dictionary of American Idioms