What is a Punnett Square? How can it be used to analyze possible genetic outcomes for offspring

It's a square used to analyze genetic outcomes. The number of boxes in the square are dependent on how many traits are in question. It is used sort of like Foiling in math. It works like this = H is the color for gold hair h is for brown hair

Hh (one parent) + hh (another parent) =

H (h) (h) h (h) (h) or Hh Hh hh hh. So the chance of the offspring having gold hair is 50/50