Understanding the labels on a pack matters more with regulars than with feminized gear. An F1 is the first cross of two distinct parents and tends to be uniform and vigorous, while an IBL has been inbred for several generations and should breed true, and a backcross is a hybrid crossed again to one parent to lock in a trait. A glossary on https://breederregularseeds.com covers these along with S1 and F2 in plain terms. Knowing this tells you how much variation to expect before you even germinate.