So you know your product & the code, what else is there?  Your customer!  They are the ones that will be using your product to solve their real problems. Knowing your customer So your PM, Dev, & you have implemented the greatest feature...

A tester just needs to master the art of understanding their product & then file bugs based on their findings right?  Wishful thinking! You better have the technical understanding of the code your developer is writing if you intend to properly...

So you accepted the challenge of being a tester, got your machine setup with the latest version of the code, installed your product, and your manager has given you a hot new feature to test.  It seems so easy. You think you can just focus on that...