To brew great beer you need to start with a good recipe, know how to evaluate your beers, and then understand the cause and effect of each ingredient and technique so you can improve the beer the next time you go to brew it.
Outside of bittering additions, adding hops during the boil is inefficient as many of the essential oils and positive attributes being sought are lost to heat. Instead, save those hops for whirlpooling or dry hopping.
Beer brewing is an art, and not just a technical exercise, as my friend Randy Mosher is fond of reminding me. Many of you know Randy as the author of great books