Reading the chart: The very first data cell contains "77 TT."  This indicates that in early position, with a called (unraised) pot, the minimum pair to call with is seven-seven, and the minimum to raise with is ten-ten.  Otherwise, fold.  The next cell to the right states that in a raised pot, you need TT to stay, but should also raise with it.  Blank spots mean no hand of that type is playable (so fold).  For explanation of basic holdem rules and terms, see article.