The law of the instrument refers to a cognitive bias in which people want to use the same "tool" for every purpose.

According to the law of the instrument, when we acquire a new skill, we tend to see opportunities to use it everywhere. This bias is also known as “the law of the hammer”, “the golden hammer”, or “Maslow’s hammer”, in reference to psychologist Abraham Maslow’s famous quote: “I suppose it is tempting, if the only tool you have is a hammer, to treat everything as if it were a nail”.

Keep this bias in mind whenever you are trying to solve a problem because you might not be using the right strategy because you are lenient towards a ONE specific problem-solving method.