When using EQ to shape you sounds, there are all kinds of words-of-wisdom and rules-of-thumb from the gurus. Some say you should avoid boosting any frequency, but instead focus only on reducing ("cutting") at target frequencies. Yet another tip is cut (reduce) narrow, boost wide. That means that when you reduce, use only narrow bandwidths but when you turn things up, us wide bandwidths.
Here is an article that discusses the merits of that last bit of EQ advice: