Meaning of A LITTLE KNOWLEDGE IS A DANGEROUS THING in English

A LITTLE KNOWLEDGE IS A DANGEROUS THING

{literary} 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./

Slang English vocab.      Английский сленговый словарь.